Some stickers are packed into exactly packets of 8.
If the stickers are repacked into packets of 10,
there are 2 less packets.
- How many packets are there?
- How many stickers are there?
|
Packets of 8 |
Packets of 10 |
Number |
1 u |
1 u - 2 |
Value |
8 |
10 |
Total value |
8 u |
10(1 u - 2) = 10 u - 20 |
(a)
Let the number of packets of 8 be 1 u.
Number of stickers in packets of 8
= 1 u x 8
= 8 u
Number of stickers in packets of 10
= 10 x (1 u - 2)
= 10 u - 20
8 u = 10 u - 20
10 u - 8 u = 20
2 u = 20
1 u = 20 ÷ 2 = 10
Number of packets of 8 = 10
(b)
Number of stickers
= 8 u
= 8 x 10
= 80
Answer(s): (a) 10; (b) 80