After using
47 of her pepper, Mrs Lin bought another 14 kg of pepper. As a result, Mrs Lin now has
107 as much pepper as what she had at first. How many kilograms of pepper did Mrs Lin have at first?
| |
Pepper |
Total |
| Before |
7 u |
7 u |
| Change 1 |
- 1 u |
|
| After 1 |
3 u |
|
| Change 2 |
+ 14 |
|
| After 2 |
3 u + 14 |
10 u |
Fraction of pepper left after using
47 of it
= 1 -
47 =
37 Amount of pepper left after using some = 3 u
Amount of pepper after buying 14 kg of pepper = 3 u + 14
3 u + 14 = 10 u
10 u - 3 u = 14
7 u = 14
1 u = 14 ÷ 7 = 2
Amount of pepper that Mrs Lin had at first
= 7 u
= 7 x 2
= 14 kg
Answer(s): 14 kg
