After using
14 of her bread flour, Mrs Yang bought another 25 kg of bread flour. As a result, Mrs Yang now has
84 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 |
4 u |
4 u |
| Change 1 |
- 1 u |
|
| After 1 |
3 u |
|
| Change 2 |
+ 25 |
|
| After 2 |
3 u + 25 |
8 u |
Fraction of bread flour left after using
14 of it
= 1 -
14 =
34 Amount of bread flour left after using some = 3 u
Amount of bread flour after buying 25 kg of bread flour = 3 u + 25
3 u + 25 = 8 u
8 u - 3 u = 25
5 u = 25
1 u = 25 ÷ 5 = 5
Amount of bread flour that Mrs Yang had at first
= 4 u
= 4 x 5
= 20 kg
Answer(s): 20 kg
