A box contains some grey, brown and black mini cupcakes. The ratio of the number of grey mini cupcakes to the number of brown mini cupcakes is 9 : 10. The ratio of the number of brown mini cupcakes to the number of black mini cupcakes is also 9 : 10. What is the ratio of the number of grey mini cupcakes to the number of black mini cupcakes in the box?
Grey |
Brown |
Black |
9x9 |
10x9 |
|
|
9x10 |
10x10 |
81 u |
90 u |
100 u |
The number of brown mini cupcakes is the repeated identity.
LCM of 9 and 10 = 90
Grey mini cupcakes : Black mini cupcakes
81 : 100
Answer(s): 81 : 100