Tim had some pastries.
37 of them were biscuits. The rest were scones. He sold
34 of the biscuits and 13 scones. In the end, he had 120 pastries left. How many pastries did he sell?
| |
Biscuits |
Scones |
Comparing pastries
at first |
3x4 =
12 u |
4x4 =
16 u |
Before
|
4x3 =
12 u |
16 u |
Change
|
- 3x3 =
- 9 u |
- 13 |
After
|
1x3 =
3 u |
16 u - 13 |
The number of biscuits at first is repeated. Make the number of biscuits at first the same. LCM of 3 and 4 is 12.
Total number of pastries left
= 3 u + 16 u - 13
= 19 u - 13
19 u - 13 = 120
19 u = 120 + 13
19 u = 133
1 u = 133 ÷ 19 = 7
Number of pastries that Tim sold
= 9 u + 13
= 9 x 7 + 13
= 63 + 13
= 76
Answer(s): 76
