After using
14 of her rice flour, Mrs Goh bought another 30 kg of rice flour. As a result, Mrs Goh now has
64 as much rice flour as what she had at first. How many kilograms of rice flour did Mrs Goh have at first?
| |
Rice Flour |
Total |
| Before |
4 u |
4 u |
| Change 1 |
- 1 u |
|
| After 1 |
3 u |
|
| Change 2 |
+ 30 |
|
| After 2 |
3 u + 30 |
6 u |
Fraction of rice flour left after using
14 of it
= 1 -
14 =
34 Amount of rice flour left after using some = 3 u
Amount of rice flour after buying 30 kg of rice flour = 3 u + 30
3 u + 30 = 6 u
6 u - 3 u = 30
3 u = 30
1 u = 30 ÷ 3 = 10
Amount of rice flour that Mrs Goh had at first
= 4 u
= 4 x 10
= 40 kg
Answer(s): 40 kg
