After using
37 of her bread flour, Mrs Yong bought another 18 kg of bread flour. As a result, Mrs Yong now has
107 as much bread flour as what she had at first. How many kilograms of bread flour did Mrs Yong have at first?
| |
Bread Flour |
Total |
| Before |
7 u |
7 u |
| Change 1 |
- 1 u |
|
| After 1 |
4 u |
|
| Change 2 |
+ 18 |
|
| After 2 |
4 u + 18 |
10 u |
Fraction of bread flour left after using
37 of it
= 1 -
37 =
47 Amount of bread flour left after using some = 4 u
Amount of bread flour after buying 18 kg of bread flour = 4 u + 18
4 u + 18 = 10 u
10 u - 4 u = 18
6 u = 18
1 u = 18 ÷ 6 = 3
Amount of bread flour that Mrs Yong had at first
= 7 u
= 7 x 3
= 21 kg
Answer(s): 21 kg
