After using
35 of her bread flour, Mrs Yong bought another 21 kg of bread flour. As a result, Mrs Yong now has
95 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 |
5 u |
5 u |
Change 1 |
- 1 u |
|
After 1 |
2 u |
|
Change 2 |
+ 21 |
|
After 2 |
2 u + 21 |
9 u |
Fraction of bread flour left after using
35 of it
= 1 -
35 =
25 Amount of bread flour left after using some = 2 u
Amount of bread flour after buying 21 kg of bread flour = 2 u + 21
2 u + 21 = 9 u
9 u - 2 u = 21
7 u = 21
1 u = 21 ÷ 7 = 3
Amount of bread flour that Mrs Yong had at first
= 5 u
= 5 x 3
= 15 kg
Answer(s): 15 kg