Question

ri needed at least $1.47 in postage to mail an envelope to his cousin overseas. If x represents the number of $0.44 cent stamps he has and y represents the number of $0.10 cent stamps he has, the inequality representing the number of stamps he can use to mail the envelope is 0.44x+0.10y≥1.47.

If Ori uses all 3 of the $0.44 cent stamps he has, what is the minimum number of $0.10 stamps he needs to use?

1
2
3
5

Answer 1

0.44(3) + 0.10y ≥ 1.47 → 1.32 + 0.10y ≥ 1.47 → 0.10y ≥ 0.15 → y ≥ 1.5.
Since y must be an integer, minimum y = 2.