The number a is 5 times as large as b. The sum of a and b is 18. What is the value of the product ab? Express your answer as a common fraction.
The number a is 5 times as large as b.
The sum of a and b is 18.
What is the value of the product ab? Express your answer as a common fraction.
a + b = 18
a = 5b
5b + b = 18
6b = 18
b = 3
a + 3 = 18
a = 15
ab = (15)(3)
ab = 45
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