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