Question

If a,b, and c are numbers such that ab+ac=60, what is the value of a/b(2b+2c)-15a) 5b) 25c) 70d) 105

Answer 1

Given that

`ab+ac=60`

We want to find the value of

`(a)/(b(2b+2c))-15`

From the first equation, we have that:

`\begin{gathered} a(b+c)=60 \\ \\ b+c=(60)/(a) \end{gathered}`

From the second equation, we have:

`(a)/(2b(b+c))-15`

Comparing the last two equations, we have: