Adam has 72 blue beads.
He has 3 times as many blue beads than red beads.
After he gives away an equal number of blue and red beads,
the number of blue beads is 5 times that of the red beads.
- How many blue beads are there in the end?
- How many red beads are there in the end?
- How many beads are there in the end?
- How many beads does Adam give away?
|
Blue beads |
Red beads |
Difference |
Before |
3 x 2 = 6 u |
1 x 2 = 2 u |
2 x 2 = 4 u |
Change |
- ? |
- ? |
|
After |
5 x 1 = 5 u |
1 x 1 = 1 u |
4 x 1 = 4 u |
(a)
The difference in the number between the blue and red beads at first and in the end remains unchanged.
LCM of 2 and 4 is 4.
6 u = 72
1 u = 72 ÷ 6 = 12
Number of blue beads in the end
= 5 u
= 5 x 12
= 60
(b)
Number of red beads in the end
= 1 u
= 1 x 12
= 12
(c)
Total number of beads in the end
= 60 + 12
= 72
(d)
Total number of beads that Adam gives away
= (6 u - 5 u) x 2
= 1 u x 2
= 2 u
= 2 x 12
= 24
Answer(s): (a) 60; (b) 12; (c) 72; (d) 24