Adam buys some stickers for his friends.
If he gives each of them 7 stickers, he needs another 11.
If he gives each of them 9 stickers, he needs another 19.
- How many friends are there?
- How many stickers does Adam buy?
(a)
Big difference
= 19 - 11
= 8
Small difference
= 9 - 7
= 2
Number of friends that Adam gives to
= 8 ÷ 2
= 4
(b)
Number of stickers that Adam buys
= 4 x 7 - 11
= 28 - 11
= 17
Answer(s): (a) 4; (b) 17