There was an equal number of blue and red marbles in a packet at first. After 18 red marbles were taken out and 32 blue marbles were added into the packet, there was
16 as many red marbles as blue marbles. Find the number of red marbles in the packet at first.
|
Blue marbles |
Red marbles |
Before |
6 u - 32 |
1 u + 18 |
Change |
+ 32 |
- 18 |
After |
6 u |
1 u |
The number of blue and red marbles in the packet is the same at first.
6 u - 32 = 1 u + 18
6 u - 1 u = 18 + 32
5 u = 50
1 u = 50 ÷ 5 = 10
Number of red marbles at first
= 1 u + 18
= 10 + 18
= 28
Answer(s)28