After using
27 of her rice flour, Mrs Seow bought another 27 kg of rice flour. As a result, Mrs Seow now has
87 as much rice flour as what she had at first. How many kilograms of rice flour did Mrs Seow have at first?
| |
Rice Flour |
Total |
| Before |
7 u |
7 u |
| Change 1 |
- 1 u |
|
| After 1 |
5 u |
|
| Change 2 |
+ 27 |
|
| After 2 |
5 u + 27 |
8 u |
Fraction of rice flour left after using
27 of it
= 1 -
27 =
57 Amount of rice flour left after using some = 5 u
Amount of rice flour after buying 27 kg of rice flour = 5 u + 27
5 u + 27 = 8 u
8 u - 5 u = 27
3 u = 27
1 u = 27 ÷ 3 = 9
Amount of rice flour that Mrs Seow had at first
= 7 u
= 7 x 9
= 63 kg
Answer(s): 63 kg
