There was an equal number of pink and red marbles in a box at first. After 16 red marbles were taken out and 47 pink marbles were added into the box, there was
14 as many red marbles as pink marbles. Find the number of red marbles in the box at first.
|
Pink marbles |
Red marbles |
Before |
4 u - 47 |
1 u + 16 |
Change |
+ 47 |
- 16 |
After |
4 u |
1 u |
The number of pink and red marbles in the box is the same at first.
4 u - 47 = 1 u + 16
4 u - 1 u = 16 + 47
3 u = 63
1 u = 63 ÷ 3 = 21
Number of red marbles at first
= 1 u + 16
= 21 + 16
= 37
Answer(s)37