Some stickers are packed into exactly packets of 9.
If the stickers are repacked into packets of 14,
there are 6 less packets and 4 stickers extra.
- How many packets are there?
- How many stickers are there?
|
Packets of 9 |
Packets of 14 |
Number |
1 u |
1 u - 6 |
Value |
9 |
14 |
Total value |
9 u |
14 u - 80 |
(a)
Let the number of packets of 9 be 1 u.
Number of stickers if they are in packets of 9
= 1 u x 9
= 9 u
Number of stickers if they are in packets of 14
= 14(1 u - 6) + 4
= 14 u - 84 + 4
= 14 u - 80
9 u = 14 u - 80
14 u - 9 u = 80
5 u = 80
1 u = 80 ÷ 5 = 16
Number of packets of 9
= 1 u
= 16
(b)
Number of stickers
= 9 u
= 9 x 16
= 144
Answer(s): (a) 16; (b) 144