The ratio of Isaac's marbles to Jayden's marbles at first was 3 : 7. After Isaac gave Jayden 118 marbles, the ratio of Isaac's marbles to Jayden's marbles is 1 : 3. What was the number of marbles they had altogether?
|
Isaac |
Jayden |
Total |
Before |
3x4 = 12 u |
7x4 = 28 u
|
10x4 = 40 u |
Change |
- 118 |
+ 118 |
|
After |
1x10 = 10 u |
3x10 = 30 u |
4x10 = 40 u |
Number of marbles that Isaac gave Jayden
= 12 u - 10 u
= 2 u
2 u = 118
1 u = 118 ÷ 2 = 59
Total number of marbles that they had
= 40 u
= 40 x 59
= 2360
Answer(s): 2360