There was an equal number of pink and green marbles in a box at first. After 24 green marbles were taken out and 40 pink marbles were added into the box, there was
13 as many green marbles as pink marbles. Find the number of green marbles in the box at first.
|
Pink marbles |
Green marbles |
Before |
3 u - 40 |
1 u + 24 |
Change |
+ 40 |
- 24 |
After |
3 u |
1 u |
The number of pink and green marbles in the box is the same at first.
3 u - 40 = 1 u + 24
3 u - 1 u = 24 + 40
2 u = 64
1 u = 64 ÷ 2 = 32
Number of green marbles at first
= 1 u + 24
= 32 + 24
= 56
Answer(s)56