Adam buys some stickers for his friends.
If he gives each of them 9 stickers, he needs another 7.
If he gives each of them 12 stickers, he needs another 16.
- How many friends are there?
- How many stickers does Adam buy?
(a)
Big difference
= 16 - 7
= 9
Small difference
= 12 - 9
= 3
Number of friends that Adam gives to
= 9 ÷ 3
= 3
(b)
Number of stickers that Adam buys
= 3 x 9 - 7
= 27 - 7
= 20
Answer(s): (a) 3; (b) 20