After using
15 of her bread flour, Mrs Chen bought another 24 kg of bread flour. As a result, Mrs Chen now has
75 as much bread flour as what she had at first. How many kilograms of bread flour did Mrs Chen have at first?
|
Bread Flour |
Total |
Before |
5 u |
5 u |
Change 1 |
- 1 u |
|
After 1 |
4 u |
|
Change 2 |
+ 24 |
|
After 2 |
4 u + 24 |
7 u |
Fraction of bread flour left after using
15 of it
= 1 -
15 =
45 Amount of bread flour left after using some = 4 u
Amount of bread flour after buying 24 kg of bread flour = 4 u + 24
4 u + 24 = 7 u
7 u - 4 u = 24
3 u = 24
1 u = 24 ÷ 3 = 8
Amount of bread flour that Mrs Chen had at first
= 5 u
= 5 x 8
= 40 kg
Answer(s): 40 kg