After using
18 of her pepper, Mrs Thium bought another 20 kg of pepper. As a result, Mrs Thium now has
128 as much pepper as what she had at first. How many kilograms of pepper did Mrs Thium have at first?
| |
Pepper |
Total |
| Before |
8 u |
8 u |
| Change 1 |
- 1 u |
|
| After 1 |
7 u |
|
| Change 2 |
+ 20 |
|
| After 2 |
7 u + 20 |
12 u |
Fraction of pepper left after using
18 of it
= 1 -
18 =
78 Amount of pepper left after using some = 7 u
Amount of pepper after buying 20 kg of pepper = 7 u + 20
7 u + 20 = 12 u
12 u - 7 u = 20
5 u = 20
1 u = 20 ÷ 5 = 4
Amount of pepper that Mrs Thium had at first
= 8 u
= 8 x 4
= 32 kg
Answer(s): 32 kg
