A farmer has 100.00 and he has to buy 100 budgies blue ones cost 10.00 green ones cost 3.00 and yellow cost .50 he has to buy at least 2 yellow and he can only spend axactly 100.00. This is a fifth grade math problem. I am a grandma trying to help my 10 year old grandson. I need help pleade.

Answer 1

10b + 3g + .5y = 100
b+g+y = 100

There's no unique solution, but you can see that

g = 20 - 19b/5
y = 80 + 14b/5

So, it is clear that b must be a multiple of 5. Now, if b=5,

g = 20-19b/5 = 20-19 = 1

So, 5 blue, 1 green and 94 yellows works out fine.

You can't have more than 5 blues, because then 20 - 19b/5 < 0