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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. 

 Jul 9, 2022
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a ==5b..............(1)

a + b ==18........(2), solve for a, b

 

From (2) above:

a ==18 - b

Sub this in (1) above:

18 - b ==5b

18 ==5b + b==6b

b==18 / 6 ==3

a ==18 - 3 == 15

 

a * b ==3 * 15 ==45

 Jul 10, 2022

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