After using
15 of her curry powder, Mrs Gan bought another 18 kg of curry powder. As a result, Mrs Gan now has
105 as much curry powder as what she had at first. How many kilograms of curry powder did Mrs Gan have at first?
| |
Curry Powder |
Total |
| Before |
5 u |
5 u |
| Change 1 |
- 1 u |
|
| After 1 |
4 u |
|
| Change 2 |
+ 18 |
|
| After 2 |
4 u + 18 |
10 u |
Fraction of curry powder left after using
15 of it
= 1 -
15 =
45 Amount of curry powder left after using some = 4 u
Amount of curry powder after buying 18 kg of curry powder = 4 u + 18
4 u + 18 = 10 u
10 u - 4 u = 18
6 u = 18
1 u = 18 ÷ 6 = 3
Amount of curry powder that Mrs Gan had at first
= 5 u
= 5 x 3
= 15 kg
Answer(s): 15 kg
