After using
27 of her pepper, Mrs Tan bought another 15 kg of pepper. As a result, Mrs Tan now has
87 as much pepper as what she had at first. How many kilograms of pepper did Mrs Tan have at first?
| |
Pepper |
Total |
| Before |
7 u |
7 u |
| Change 1 |
- 1 u |
|
| After 1 |
5 u |
|
| Change 2 |
+ 15 |
|
| After 2 |
5 u + 15 |
8 u |
Fraction of pepper left after using
27 of it
= 1 -
27 =
57 Amount of pepper left after using some = 5 u
Amount of pepper after buying 15 kg of pepper = 5 u + 15
5 u + 15 = 8 u
8 u - 5 u = 15
3 u = 15
1 u = 15 ÷ 3 = 5
Amount of pepper that Mrs Tan had at first
= 7 u
= 7 x 5
= 35 kg
Answer(s): 35 kg
