Gwen made 315 tarts and biscuits. After she gave 0.7 of the tarts and 0.6 of the biscuits to her children, she was left with an equal number of tarts and biscuits. How many tarts had she left?
| |
Tarts |
Biscuits |
Before
|
10x2 =
20 u |
5x3 =
15 u |
Change
|
- 7x2 =
- 14 u |
- 3x3 =
- 9 u |
After
|
3x2 =
6 u |
2x3 =
6 u |
Comparing tarts and
biscuits in the end |
1x6 =
6 u |
1x6 =
6 u |
0.7 =
710 0.6 =
610 =
35 The number of tarts and biscuits is the same in the end. Make the number of tarts and biscuits in the end the same. LCM of 3 and 2 and 1 is 6.
Total number of tarts and biscuits at first
= 20 u + 15 u
= 35 u
35 u = 315
1 u = 315 ÷ 35 = 9
Number of tarts that Gwen had left
= 6 u
= 6 x 9
= 54
Answer(s): 54
