Winnie made 520 cupcakes and biscuits. After she gave 0.3 of the cupcakes and 0.4 of the biscuits to her pupils, she was left with an equal number of cupcakes and biscuits. How many cupcakes had she left?
| |
Cupcakes |
Biscuits |
Before
|
10x3 =
30 u |
5x7 =
35 u |
Change
|
- 3x3 =
- 9 u |
- 2x7 =
- 14 u |
After
|
7x3 =
21 u |
3x7 =
21 u |
Comparing cupcakes and
biscuits in the end |
1x21 =
21 u |
1x21 =
21 u |
0.3 =
310 0.4 =
410 =
25 The number of cupcakes and biscuits is the same in the end. Make the number of cupcakes and biscuits in the end the same. LCM of 7 and 3 and 1 is 21.
Total number of cupcakes and biscuits at first
= 30 u + 35 u
= 65 u
65 u = 520
1 u = 520 ÷ 65 = 8
Number of cupcakes that Winnie had left
= 21 u
= 21 x 8
= 168
Answer(s): 168
