After using
17 of her bread flour, Mrs Ang bought another 12 kg of bread flour. As a result, Mrs Ang now has
107 as much bread flour as what she had at first. How many kilograms of bread flour did Mrs Ang have at first?
|
Bread Flour |
Total |
Before |
7 u |
7 u |
Change 1 |
- 1 u |
|
After 1 |
6 u |
|
Change 2 |
+ 12 |
|
After 2 |
6 u + 12 |
10 u |
Fraction of bread flour left after using
17 of it
= 1 -
17 =
67 Amount of bread flour left after using some = 6 u
Amount of bread flour after buying 12 kg of bread flour = 6 u + 12
6 u + 12 = 10 u
10 u - 6 u = 12
4 u = 12
1 u = 12 ÷ 4 = 3
Amount of bread flour that Mrs Ang had at first
= 7 u
= 7 x 3
= 21 kg
Answer(s): 21 kg