kum bought a total of 2.65 dollars worth of postage stamps in four denominations. if she bought an equal number of 5-cent and 25-cent stamps and twice as many 10-cent stamps as 5-cent stamps, what is the least number of 1-cent stamps she could have bought?
so 1A + 5B + 10C + 25D =265
we know that B=D and C=2*B, so we can rewrite
1A + 5B + 20B + 25B = 265
to maximize B: 265-50*5=15. so answer is C?