After using
18 of her chicken powder, Mrs Sim bought another 15 kg of chicken powder. As a result, Mrs Sim now has
128 as much chicken powder as what she had at first. How many kilograms of chicken powder did Mrs Sim have at first?
|
Chicken Powder |
Total |
Before |
8 u |
8 u |
Change 1 |
- 1 u |
|
After 1 |
7 u |
|
Change 2 |
+ 15 |
|
After 2 |
7 u + 15 |
12 u |
Fraction of chicken powder left after using
18 of it
= 1 -
18 =
78 Amount of chicken powder left after using some = 7 u
Amount of chicken powder after buying 15 kg of chicken powder = 7 u + 15
7 u + 15 = 12 u
12 u - 7 u = 15
5 u = 15
1 u = 15 ÷ 5 = 3
Amount of chicken powder that Mrs Sim had at first
= 8 u
= 8 x 3
= 24 kg
Answer(s): 24 kg