Adam buys some stickers for his friends.
If he gives each of them 7 stickers, he needs another 10.
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 - 10
= 10
Small difference
= 9 - 7
= 2
Number of friends that Adam gives to
= 10 ÷ 2
= 5
(b)
Number of stickers that Adam buys
= 5 x 7 - 10
= 35 - 10
= 25
Answer(s): (a) 5; (b) 25