There was an equal number of pink and gold marbles in a bag at first. After 25 gold marbles were taken out and 35 pink marbles were added into the bag, there was
13 as many gold marbles as pink marbles. Find the number of gold marbles in the bag at first.
| |
Pink marbles |
Gold marbles |
| Before |
3 u - 35 |
1 u + 25 |
| Change |
+ 35 |
- 25 |
| After |
3 u |
1 u |
The number of pink and gold marbles in the bag is the same at first.
3 u - 35 = 1 u + 25
3 u - 1 u = 25 + 35
2 u = 60
1 u = 60 ÷ 2 = 30
Number of gold marbles at first
= 1 u + 25
= 30 + 25
= 55
Answer(s)55
