Adam buys some stickers for his friends.
If he gives each of them 3 stickers, he has 7 stickers left.
If he gives each of them 5 stickers, he needs another 9.
- How many friends are there?
- How many stickers does Adam buy?
(a)
Big difference
= 7 + 9
= 16
Small difference
= 5 - 3
= 2
Number of friends that Adam gives to
= 16 ÷ 2
= 8
(b)
Number of stickers that Adam buys
= 8 x 3 + 7
= 24 + 7
= 31
Answer(s): (a) 8; (b) 31