There was an equal number of grey and white beads in a box at first. After 20 white beads were taken out and 38 grey beads were added into the box, there was
13 as many white beads as grey beads. Find the number of white beads in the box at first.
| |
Grey beads |
White beads |
| Before |
3 u - 38 |
1 u + 20 |
| Change |
+ 38 |
- 20 |
| After |
3 u |
1 u |
The number of grey and white beads in the box is the same at first.
3 u - 38 = 1 u + 20
3 u - 1 u = 20 + 38
2 u = 58
1 u = 58 ÷ 2 = 29
Number of white beads at first
= 1 u + 20
= 29 + 20
= 49
Answer(s)49
