There was an equal number of gold and yellow marbles in a packet at first. After 25 yellow marbles were taken out and 35 gold marbles were added into the packet, there was
15 as many yellow marbles as gold marbles. Find the number of yellow marbles in the packet at first.
| |
Gold marbles |
Yellow marbles |
| Before |
5 u - 35 |
1 u + 25 |
| Change |
+ 35 |
- 25 |
| After |
5 u |
1 u |
The number of gold and yellow marbles in the packet is the same at first.
5 u - 35 = 1 u + 25
5 u - 1 u = 25 + 35
4 u = 60
1 u = 60 ÷ 4 = 15
Number of yellow marbles at first
= 1 u + 25
= 15 + 25
= 40
Answer(s)40
