After using
25 of her rice flour, Mrs Cheong bought another 28 kg of rice flour. As a result, Mrs Cheong now has
75 as much rice flour as what she had at first. How many kilograms of rice flour did Mrs Cheong have at first?
| |
Rice Flour |
Total |
| Before |
5 u |
5 u |
| Change 1 |
- 1 u |
|
| After 1 |
3 u |
|
| Change 2 |
+ 28 |
|
| After 2 |
3 u + 28 |
7 u |
Fraction of rice flour left after using
25 of it
= 1 -
25 =
35 Amount of rice flour left after using some = 3 u
Amount of rice flour after buying 28 kg of rice flour = 3 u + 28
3 u + 28 = 7 u
7 u - 3 u = 28
4 u = 28
1 u = 28 ÷ 4 = 7
Amount of rice flour that Mrs Cheong had at first
= 5 u
= 5 x 7
= 35 kg
Answer(s): 35 kg
