A box contains some black, gold and silver mochi balls. The ratio of the number of black mochi balls to the number of gold mochi balls is 2 : 9. The ratio of the number of gold mochi balls to the number of silver mochi balls is also 2 : 9. What is the ratio of the number of black mochi balls to the number of silver mochi balls in the box?
Black |
Gold |
Silver |
2x2 |
9x2 |
|
|
2x9 |
9x9 |
4 u |
18 u |
81 u |
The number of gold mochi balls is the repeated identity.
LCM of 2 and 9 = 18
Black mochi balls : Silver mochi balls
4 : 81
Answer(s): 4 : 81