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