At first, Lee had 185 more grey beads than red beads in a box. Each day, he took out 10 grey beads and 4 red beads from the box. After some time, he only had 49 red beads left in the box.
- How many beads did Lee take out from the box altogether?
- How many red beads did Lee have at first?
| |
Grey beads |
Red beads |
Comparing grey beads
and red beads at first |
185 more |
|
| Before |
10 u |
4 u + 49 |
| Change |
- 10 u |
- 4 u |
| After |
0 |
49 |
(a)
If another 185 red beads are added into the box at first, the number of grey and red beads will be the same.
10 u = 4 u + 49 + 185
10 u - 4 u = 49 + 185
6 u = 234
1 u = 234 ÷ 6 = 39
Number of beads that Lee took out
= 10 u + 4 u
= 14 u
= 14 x 39
= 546
(b)
Number of beads that Lee had at first
= 546 + 49
= 595
Answer(s): (a) 546; (b) 595
