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 3 stickers left.
- How many friends are there?
- How many stickers does Adam buy?
(a)
Big difference
= 15 - 3
= 12
Small difference
= 9 - 7
= 2
Number of friends that Adam gives to
= 12 ÷ 2
= 6
(b)
Number of stickers that Adam buys
= 6 x 7 + 15
= 42 + 15
= 57
Answer(s): (a) 6; (b) 57