Rael and Valen have a total of 80 marbles. If Rael gives Valen 21 marbles, Valen will have 3 times as many marbles as him. Find
(a) Rael's marbles
(b) Valen's marbles
|
Rael |
Valen |
Total |
Before |
1 u + 21 |
3 u - 21 |
80 |
Change |
- 21 |
+ 21 |
|
After |
1 u |
3 u |
4 u |
(a)
Total number of marbles
= 1 u + 3 u
= 4 u
4 u = 80
1 u = 80 ÷ 4 = 20
Number of marbles that Rael has
= 1 u + 21
= 20 + 21
= 41
(b)
Number of marbles that Valen has
= 80 - 41
= 39
Answer(s): (a) 41; (b) 39