Shannon made 342 shortbreads and biscuits. After she gave 0.3 of the shortbreads and 0.75 of the biscuits to her pupils, she was left with an equal number of shortbreads and biscuits. How many biscuits had she left?
| |
Shortbreads |
Biscuits |
Before
|
10x1 =
10 u |
4x7 =
28 u |
Change
|
- 3x1 =
- 3 u |
- 3x7 =
- 21 u |
After
|
7x1 =
7 u |
1x7 =
7 u |
Comparing shortbreads and
biscuits in the end |
1x7 =
7 u |
1x7 =
7 u |
0.3 =
310 0.75 =
75100 =
34 The number of shortbreads and biscuits is the same in the end. Make the number of shortbreads and biscuits in the end the same. LCM of 7 and 1 and 1 is 7.
Total number of shortbreads and biscuits at first
= 10 u + 28 u
= 38 u
38 u = 342
1 u = 342 ÷ 38 = 9
Number of biscuits that Shannon had left
= 7 u
= 7 x 9
= 63
Answer(s): 63
