Question

The ratio of red to blue m7m's in a jar is 5:7. if there are 108 m&m's in the jar, how many are red

Answer 1

r : b = 5 : 7
r + b = 108
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7 r = 5 b
b = 7 r / 5
r + 7 r / 5  = 108  / * 5
5 r + 7 r = 540
12 r = 540
r = 540 : 12
r = 45
Answer: There are 45 red ones in the jar.