At first, Oscar had 131 more pink beads than gold beads in a box. Each day, he took out 8 pink beads and 2 gold beads from the box. After some time, he only had 31 gold beads left in the box.
- How many beads did Oscar take out from the box altogether?
- How many gold beads did Oscar have at first?
| |
Pink beads |
Gold beads |
Comparing pink beads
and gold beads at first |
131 more |
|
| Before |
8 u |
2 u + 31 |
| Change |
- 8 u |
- 2 u |
| After |
0 |
31 |
(a)
If another 131 gold beads are added into the box at first, the number of pink and gold beads will be the same.
8 u = 2 u + 31 + 131
8 u - 2 u = 31 + 131
6 u = 162
1 u = 162 ÷ 6 = 27
Number of beads that Oscar took out
= 8 u + 2 u
= 10 u
= 10 x 27
= 270
(b)
Number of beads that Oscar had at first
= 270 + 31
= 301
Answer(s): (a) 270; (b) 301
