Adam buys some stickers for his friends.
If he gives each of them 10 stickers, he needs another 11.
If he gives each of them 13 stickers, he needs another 20.
- How many friends are there?
- How many stickers does Adam buy?
(a)
Big difference
= 20 - 11
= 9
Small difference
= 13 - 10
= 3
Number of friends that Adam gives to
= 9 ÷ 3
= 3
(b)
Number of stickers that Adam buys
= 3 x 10 - 11
= 30 - 11
= 19
Answer(s): (a) 3; (b) 19