After using
35 of her bread flour, Mrs Soh bought another 20 kg of bread flour. As a result, Mrs Soh now has
125 as much bread flour as what she had at first. How many kilograms of bread flour did Mrs Soh have at first?
|
Bread Flour |
Total |
Before |
5 u |
5 u |
Change 1 |
- 1 u |
|
After 1 |
2 u |
|
Change 2 |
+ 20 |
|
After 2 |
2 u + 20 |
12 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 20 kg of bread flour = 2 u + 20
2 u + 20 = 12 u
12 u - 2 u = 20
10 u = 20
1 u = 20 ÷ 10 = 2
Amount of bread flour that Mrs Soh had at first
= 5 u
= 5 x 2
= 10 kg
Answer(s): 10 kg