After using
411 of her pepper, Mrs Neo bought another 20 kg of pepper. As a result, Mrs Neo now has
1211 as much pepper as what she had at first. How many kilograms of pepper did Mrs Neo have at first?
| |
Pepper |
Total |
| Before |
11 u |
11 u |
| Change 1 |
- 1 u |
|
| After 1 |
7 u |
|
| Change 2 |
+ 20 |
|
| After 2 |
7 u + 20 |
12 u |
Fraction of pepper left after using
411 of it
= 1 -
411 =
711 Amount of pepper left after using some = 7 u
Amount of pepper after buying 20 kg of pepper = 7 u + 20
7 u + 20 = 12 u
12 u - 7 u = 20
5 u = 20
1 u = 20 ÷ 5 = 4
Amount of pepper that Mrs Neo had at first
= 11 u
= 11 x 4
= 44 kg
Answer(s): 44 kg
