Adam buys some stickers for his friends.
If he gives each of them 7 stickers, he needs another 7.
If he gives each of them 10 stickers, he needs another 16.
- How many friends are there?
- How many stickers does Adam buy?
(a)
Big difference
= 16 - 7
= 9
Small difference
= 10 - 7
= 3
Number of friends that Adam gives to
= 9 ÷ 3
= 3
(b)
Number of stickers that Adam buys
= 3 x 7 - 7
= 21 - 7
= 14
Answer(s): (a) 3; (b) 14