r = 25+b
n = 3b
n+r+b=435
3b+25+b+b=435
5b+25=435
5b=210
b=42
r = 25+42 = 67
n = 3(42) = 126
Answer:
Step-by-step explanation:
You find the part by expressing the ratio as a fraction, then simplifying.
1. 5/20 = (1·5)/(4·5) = (1/4)·(5/5) = 1/4
5 is 1/4 of 20.
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2. 12/20 = (3·4)/(5·4) = (3/5)·(4/4) = 3/5
12 is 3/5 of 20.
Area of the base
C. The 40th customer
