1. Guna has x 2-dollar notes and y 5-dollar notes. The total value of the notes is $100
Form an equation connecting x and y . 2x + 5y = 100
If Guna has at most 20 2-dollar notes, use the equation in (i), find the possible number of 5-dollar notes
How do I present my answer?
2. For interests and stuff
If I am buying something inclusive of 5% GST and the thing costs $750
so 105% -> 750 ? (just an example)
Hi,
Since 2x + 5y = 100, x = (100 - 5y)/2.
Now it is given that x <= 20, we will obtain (100 - 5y)/2 < = 20 and the rest of the steps I'll leave you to proceed.
Yes, you are correct for the 2nd question. Thanks!
Cheers,
Wen Shih