Some stickers are packed into exactly packets of 9.
If the stickers are repacked into packets of 14,
there are 3 less packets and 2 stickers extra.
- How many packets are there?
- How many stickers are there?
|
Packets of 9 |
Packets of 14 |
Number |
1 u |
1 u - 3 |
Value |
9 |
14 |
Total value |
9 u |
14 u - 40 |
(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 - 3) + 2
= 14 u - 42 + 2
= 14 u - 40
9 u = 14 u - 40
14 u - 9 u = 40
5 u = 40
1 u = 40 ÷ 5 = 8
Number of packets of 9
= 1 u
= 8
(b)
Number of stickers
= 9 u
= 9 x 8
= 72
Answer(s): (a) 8; (b) 72