Adam buys some stickers for his friends.
If he gives each of them 7 stickers, he has 15 stickers left.
If he gives each of them 9 stickers, he has 9 stickers left.
- How many friends are there?
- How many stickers does Adam buy?
(a)
Big difference
= 15 - 9
= 6
Small difference
= 9 - 7
= 2
Number of friends that Adam gives to
= 6 ÷ 2
= 3
(b)
Number of stickers that Adam buys
= 3 x 7 + 15
= 21 + 15
= 36
Answer(s): (a) 3; (b) 36