Adam buys some stickers for his friends.
If he gives each of them 7 stickers, he needs another 2.
If he gives each of them 9 stickers, he needs another 20.
- How many friends are there?
- How many stickers does Adam buy?
(a)
Big difference
= 20 - 2
= 18
Small difference
= 9 - 7
= 2
Number of friends that Adam gives to
= 18 ÷ 2
= 9
(b)
Number of stickers that Adam buys
= 9 x 7 - 2
= 63 - 2
= 61
Answer(s): (a) 9; (b) 61