After using
45 of her chilli powder, Mrs Lim bought another 20 kg of chilli powder. As a result, Mrs Lim now has
65 as much chilli powder as what she had at first. How many kilograms of chilli powder did Mrs Lim have at first?
| |
Chilli Powder |
Total |
| Before |
5 u |
5 u |
| Change 1 |
- 1 u |
|
| After 1 |
1 u |
|
| Change 2 |
+ 20 |
|
| After 2 |
1 u + 20 |
6 u |
Fraction of chilli powder left after using
45 of it
= 1 -
45 =
15 Amount of chilli powder left after using some = 1 u
Amount of chilli powder after buying 20 kg of chilli powder = 1 u + 20
1 u + 20 = 6 u
6 u - 1 u = 20
5 u = 20
1 u = 20 ÷ 5 = 4
Amount of chilli powder that Mrs Lim had at first
= 5 u
= 5 x 4
= 20 kg
Answer(s): 20 kg
