Question

(19)

Betty has s stickers. Liza has 11 fewer stickers than Betty.
a) Find the number of stickers they have in all, in terms of s.
b) If Betty has 31 stickers, how many stickers do they have in all?

Answer 1

2s-11

51

Explanation:

“N fewer than Y” is Y-N, so Liza has s-11 stickers while Betty has s. They have 2s-11 stickers combined.

If Betty has 31 stickers, s = 31 and they have 2s-11 = 62-11 = 51 stickers total.