After using
45 of her rice flour, Mrs Ong bought another 24 kg of rice flour. As a result, Mrs Ong now has
75 as much rice flour as what she had at first. How many kilograms of rice flour did Mrs Ong have at first?
| |
Rice Flour |
Total |
| Before |
5 u |
5 u |
| Change 1 |
- 1 u |
|
| After 1 |
1 u |
|
| Change 2 |
+ 24 |
|
| After 2 |
1 u + 24 |
7 u |
Fraction of rice flour left after using
45 of it
= 1 -
45 =
15 Amount of rice flour left after using some = 1 u
Amount of rice flour after buying 24 kg of rice flour = 1 u + 24
1 u + 24 = 7 u
7 u - 1 u = 24
6 u = 24
1 u = 24 ÷ 6 = 4
Amount of rice flour that Mrs Ong had at first
= 5 u
= 5 x 4
= 20 kg
Answer(s): 20 kg
