After using
110 of her pepper, Mrs Kok bought another 15 kg of pepper. As a result, Mrs Kok now has
1210 as much pepper as what she had at first. How many kilograms of pepper did Mrs Kok have at first?
| |
Pepper |
Total |
| Before |
10 u |
10 u |
| Change 1 |
- 1 u |
|
| After 1 |
9 u |
|
| Change 2 |
+ 15 |
|
| After 2 |
9 u + 15 |
12 u |
Fraction of pepper left after using
110 of it
= 1 -
110 =
910 Amount of pepper left after using some = 9 u
Amount of pepper after buying 15 kg of pepper = 9 u + 15
9 u + 15 = 12 u
12 u - 9 u = 15
3 u = 15
1 u = 15 ÷ 3 = 5
Amount of pepper that Mrs Kok had at first
= 10 u
= 10 x 5
= 50 kg
Answer(s): 50 kg
