desteny desteny

05-01-2016
Mathematics

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the ratio of blue marbles to red marbles in a bag is 11:9.If there are 99 blue marbles in the bag,how many red marbles are there?

Respuesta :

Billymkhoi Billymkhoi

05-01-2016

Let the number of red marbles be x.

We have: 99/x = 11/9

Cross multiply:
11x = 99*9
⇒ x= (99*9/11)= 81

There are 81 red marbles~

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