Some stickers are packed into exactly packets of 13.
If the stickers are repacked into packets of 8,
there are 7 more packets and 4 stickers left.
- How many packets are there?
- How many stickers are there?
|
Packets of 13 |
Packets of 8 |
Number |
1 u |
1 u + 7 |
Value |
13 |
8 |
Total value |
13 u |
8(1 u + 7) + 4 = 8 u + 60 |
(a)
Let the number of packets of 13 be 1 u.
Number of stickers if they are in packets of 13
= 1 u x 13
= 13 u
Number of stickers if they are in packets of 8
= 8 x (1 u + 7) + 4
= 8 u + 56 + 4
= 8 u + 60
13 u = 8 u + 60
13 u - 8 u = 60
5 u = 60
1 u = 60 ÷ 5 = 12
Number of packets of 13
= 1 u
= 12
(b)
Number of stickers
= 13 u
= 13 x 12
= 156
Answer(s): (a) 12; (b) 156