iicekingmann
19.11.2019 •
Mathematics
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?
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Ответ:
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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