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How many red bricks were used?

Red and gray bricks were used to build a decorative wall. The number of red blocks/number of gray bricks was 5/2. There were 175 bricks used in all. How many red bricks were used?
A) 25
B) 125
C) 50
D) 35
I'm not sure what the answer is to this one.

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Aruna K. | Experienced & National Board Certified Chemistry TeacherExperienced & National Board Certified C...
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The ratio of 5/2 indicates that for every 5 Red bricks 2 Gray bricks are used which means 5 red bricks out of 7 total bricks. 
Set it as a proportion
(5/7) x 175 = 125 
Hope this helps.