Opal has 3 times as many marbles as Jaslyn. Jaslyn has
27 as many marbles as Diana. If the three of them have a total of 30 marbles, how many marbles does Opal have?
Opal |
Jaslyn |
Diana |
3x2 |
1x2 |
|
|
2x1 |
7x1 |
6 u |
2 u |
7 u |
The number of marbles that Jaslyn has is repeated. Make the number of marbles that Jaslyn has the same. LCM of 1 and 2 is 2.
Total number of marbles that the three of them have
= 6 u + 2 u + 7 u
= 15 u
15 u = 30
1 u = 30 ÷ 15 = 2
Number of marbles that Opal has
= 6 u
= 6 x 2
= 12
Answer(s): 12