Percentage Problem Sums
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A minute ago,40% of the 480 children in a school hall were girls. Some more children entered the hall and the number of boys increased by 50%. Now 80% of the children in the hall are girls. How many girls had just entered the school hall?
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Entrance tickets to the Jurong Bird Park are $4 each for a child. Each ticket for an adult costs 25% more. Yesterday,60% of the tickets sold were for children. The total sale of the tickets amounted to $5940. What was the total value of tickets sold for adults?
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The ratio of the number of plants in plantation A to that in plantation B was 12:5. Last week, a fire destroyed 80% of the plants in plantation A. What percentage of the plants in plantation B must be transplanted to plantation A so that there will be an equal number of plants in the two plantations?
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Originally posted by Ashleeann hannah:
A minute ago,40% of the 480 children in a school hall were girls. Some more children entered the hall and the number of boys increased by 50%. Now 80% of the children in the hall are girls. How many girls had just entered the school hall?
40% X 480 = 192 girls = 288 boys
50% increase = 432 boys (20%)
No. of girls (80%) = 432 X 4 = 1728
No. of girls entered = 1728 - 192 = 1536
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Originally posted by Ashleeann hannah:
Entrance tickets to the Jurong Bird Park are $4 each for a child. Each ticket for an adult costs 25% more. Yesterday,60% of the tickets sold were for children. The total sale of the tickets amounted to $5940. What was the total value of tickets sold for adults?
Adult ticket = 25% more than child ticket
40% adult ticket price = 40 X 125% = 50% children ticket price
Total sales = 5940 = 50 + 60 = 110%
Adult tickets = 50% = $2700
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Originally posted by Ashleeann hannah:
The ratio of the number of plants in plantation A to that in plantation B was 12:5. Last week, a fire destroyed 80% of the plants in plantation A. What percentage of the plants in plantation B must be transplanted to plantation A so that there will be an equal number of plants in the two plantations?
80% of 12 = 9.6
Plants left = 2.4
Ratio = 2.4:5
To balence out means need 3.7
This means 1.3 of B must go to A.
% of plants to transfer is 1.3/5 X 100% = 26%
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Originally posted by Ashleeann hannah:
Entrance tickets to the Jurong Bird Park are $4 each for a child. Each ticket for an adult costs 25% more. Yesterday,60% of the tickets sold were for children. The total sale of the tickets amounted to $5940. What was the total value of tickets sold for adults?
1 Child Ticket: $41 Adult Ticket: $5
40% Adult Tickets, 60% Children Tickets
For every 4 adults, there are 6 children.
Price of 4 Adult Tickets + 6 Children Tickets = $20+$24
= $44 (1 group)
Number of groups: $5940÷$44=135
1 group has 4 adults.
135 groups have 540 adults.
540 adult tickets cost $2700.
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Hi
Hope this helps.I assume that this is a P5/6 question and calculator is allowed to be used.
