After using
47 of her bread flour, Mrs Yang bought another 10 kg of bread flour. As a result, Mrs Yang now has
87 as much bread flour as what she had at first. How many kilograms of bread flour did Mrs Yang have at first?
| |
Bread Flour |
Total |
| Before |
7 u |
7 u |
| Change 1 |
- 1 u |
|
| After 1 |
3 u |
|
| Change 2 |
+ 10 |
|
| After 2 |
3 u + 10 |
8 u |
Fraction of bread flour left after using
47 of it
= 1 -
47 =
37 Amount of bread flour left after using some = 3 u
Amount of bread flour after buying 10 kg of bread flour = 3 u + 10
3 u + 10 = 8 u
8 u - 3 u = 10
5 u = 10
1 u = 10 ÷ 5 = 2
Amount of bread flour that Mrs Yang had at first
= 7 u
= 7 x 2
= 14 kg
Answer(s): 14 kg
