Problem with Math Question?
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"There are 84 pupils at a farm . Each boy is given 6 apples , and each girl is given 3 apples . The boys have 110 more apples than girls . How many boys are there in the farm?"Is there something wrong with this question? I can't seem to get a whole number for the number of boys...
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Q. Susan bought a total 1200 yellow and blue marbles , of which 15% were yellow marbles . When she gave away some marbles , the percentage of blue marbles became 70% of the total number of marbles left . How many blue marbles did she gave away?
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Originally posted by -Wanderer-:"There are 84 pupils at a farm . Each boy is given 6 apples , and each girl is given 3 apples . The boys have 110 more apples than girls . How many boys are there in the farm?"Is there something wrong with this question? I can't seem to get a whole number for the number of boys...
Hmm... something seems to be wrong alright.
Could it possibly be 111 instead?
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6b - 3g = 110
b + g = 84b = 84 - g
6(84 - g) - 3g = 110
504 - 6g - 3g = 110
504 - 110 = 9g
394 = 9g
g = 394/9
b = 84 - 394/9
b = 84 - 43 7/9
b = 40 2/9Hence, there are 40 boys, 43 girls, and 1 who is more girly than boyish at the farm (he or she took 9/5 apples, by the way).
If all are straights, the difference should have been a multiple of 9 (504 - d = 9g), ie. "108 more apples".
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110 divided by 6 = 18 ( round down )
84 - 18 = 66
66 divided by 2 = 33
total boys = 33 + 18 = 51
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Ken had $20 more than Minnie at first . After Ken had given 1/5 to Minnie , Minnie had $64 . How much does Minnie have at first ?
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I realised I suck at using models to do Primary School Math Questions. Why can't I use Algebra instead??? :(
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Originally posted by -Wanderer-:
Ken had $20 more than Minnie at first . After Ken had given 1/5 to Minnie , Minnie had $64 . How much does Minnie have at first ?
K: x + 20
M x
After
K: 4/5x + 16
M: 6/5x + 4
6/5x + 4 = $64
x = 50
I still remember during my PSLE in 2007 I did something like this... because I sux at drawing
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Originally posted by Forbiddensinner:
Hmm... something seems to be wrong alright.
Could it possibly be 111 instead?
I'm not sure. I think my student typed for me wrongly... :( -
Originally posted by -Wanderer-:
I realised I suck at using models to do Primary School Math Questions. Why can't I use Algebra instead??? :(
Yeah create an equation first.
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Originally posted by ƒlame:
Yeah create an equation first.
The thing is, my students have not learnt Algebra yet. I don't want to show that something that would confuse them. I know how to do all the questions (Marbles, Minnie) using algebra but not via model. Can someone show me how? Thanks! -
Originally posted by -Wanderer-:
Q. Susan bought a total 1200 yellow and blue marbles , of which 15% were yellow marbles . When she gave away some marbles , the percentage of blue marbles became 70% of the total number of marbles left . How many blue marbles did she gave away?
180 yellow, 1020 blue
After
3x yellow, 7x blue
assume that yellow marbles never change
180/3 = 60
7 x 60 = 420
1020 - 420 = 600
like tt can?
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Originally posted by LatecomerX:
6b - 3g = 110
b + g = 84b = 84 - g
6(84 - g) - 3g = 110
504 - 6g - 3g = 110
504 - 110 = 9g
394 = 9g
g = 394/9
b = 84 - 394/9
b = 84 - 43 7/9
b = 40 2/9Hence, there are 40 boys, 43 girls, and 1 who is more girly than boyish at the farm (he or she took 9/5 apples, by the way).
If all are straights, the difference should have been a multiple of 9 (504 - d = 9g), ie. "108 more apples".
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Originally posted by BillaMax:
180 yellow, 1020 blue
After
3x yellow, 7x blue
assume that yellow marbles never change
180/3 = 60
7 x 60 = 420
1020 - 420 = 600
like tt can?
Anyone calculate? Is my answers correct? If not I want to redo...
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Originally posted by -Wanderer-:
Ken had $20 more than Minnie at first . After Ken had given 1/5 to Minnie , Minnie had $64 . How much does Minnie have at first ?
At first
Ken l____l____l____l____l____l________l ( Big one = $20 )
Minnie l____l____l____l____l____l
Now
Ken l____l____l____l____l______l ( Big one = $16, since 1/5 is given away )
Minnie l____l____l____l____l____l____l__l ( Small one = $4 )
Hence, $64 = 6 units + $4
6 units = $60
1 unit = $10
At first, Minnie = 5 units = $50
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Originally posted by BillaMax:
180 yellow, 1020 blue
After
3x yellow, 7x blue
assume that yellow marbles never change
180/3 = 60
7 x 60 = 420
1020 - 420 = 600
like tt can?
Should be okay, cause I think this question also missing something, for there is more than one answer to it.
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Hey guys, thanks for all your help this while. The Minnie questions is finally solved using a model (I got $50 too). Thanks to forbiddensinner for that. :)
I also think there is something wrong with the marbles question too...
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Originally posted by BillaMax:
180 yellow, 1020 blue
After
3x yellow, 7x blue
assume that yellow marbles never change
180/3 = 60
7 x 60 = 420
1020 - 420 = 600
like tt can?
yes have to assume.. i tried using simultaneous equation, change here and there but still cannot.. haha! a bit silly ar me..