Question

If (a+b)=(6/7) and (a/c)=(2/5) what is the value of 3b+c in terms of a ?
a) 12a
b) 9a
c) 8a
d) 6a
e) 4a

Answer 1

(a+b)=(6/7) -equation 1

Solve for a.

a = 6/7 - b

Now use this value and insert in equation 2
(a/c)=(2/5)
\[\Large \frac{ \frac 67 - b}{c} = \frac 25\]

Now solve for c.

Answer 2

how do i solve for a

Answer 3

-Make (a) the subject

Answer 4

If i'm not wrong it's a SAT question?

Answer 5

Yes its a SAT question

Answer 6

Dang! i'm going the long way. -_-
Let me show you again.. easier method..