At first, Ken had 121 more white beads than green beads in a box. Each day, he took out 9 white beads and 5 green beads from the box. After some time, he only had 27 green beads left in the box.
- How many beads did Ken take out from the box altogether?
- How many green beads did Ken have at first?
| |
White beads |
Green beads |
Comparing white beads
and green beads at first |
121 more |
|
| Before |
9 u |
5 u + 27 |
| Change |
- 9 u |
- 5 u |
| After |
0 |
27 |
(a)
If another 121 green beads are added into the box at first, the number of white and green beads will be the same.
9 u = 5 u + 27 + 121
9 u - 5 u = 27 + 121
4 u = 148
1 u = 148 ÷ 4 = 37
Number of beads that Ken took out
= 9 u + 5 u
= 14 u
= 14 x 37
= 518
(b)
Number of beads that Ken had at first
= 518 + 27
= 545
Answer(s): (a) 518; (b) 545
