After using
57 of her pepper, Mrs Chau bought another 18 kg of pepper. As a result, Mrs Chau now has
117 as much pepper as what she had at first. How many kilograms of pepper did Mrs Chau have at first?
| |
Pepper |
Total |
| Before |
7 u |
7 u |
| Change 1 |
- 1 u |
|
| After 1 |
2 u |
|
| Change 2 |
+ 18 |
|
| After 2 |
2 u + 18 |
11 u |
Fraction of pepper left after using
57 of it
= 1 -
57 =
27 Amount of pepper left after using some = 2 u
Amount of pepper after buying 18 kg of pepper = 2 u + 18
2 u + 18 = 11 u
11 u - 2 u = 18
9 u = 18
1 u = 18 ÷ 9 = 2
Amount of pepper that Mrs Chau had at first
= 7 u
= 7 x 2
= 14 kg
Answer(s): 14 kg
