Question

(b/c)=7, how do you solve for c?

Answer 1

Make up a number for b and divide it by 7

Answer 2

i'm using whatever c equals to solve an equation, so that doesn't work, thanks though!

Answer 3

this is change of subject...

multiply both sides of the equation by c

which gives

b = 7c

now divide both sides by 7

so c = b/7

question done.

Answer 4

so how would you solve:
(a+b)=3 (b+c)=7 and you need to solve (a+b)/(b+c)

Answer 5

@campbell_st

Answer 6

so its simply 3/7

since (a+b) = 3
----------
(b + c) = 7

Answer 7

@campbell_st I don' think that is right, the question is

Answer 8

if a, b and c are real numbers such that (a/b)=3 and (b/c)=7, then (a+b)/(b+c) equals what?

Answer 9

@campbell_st i wrote the wrong problem before ii am sorry

Answer 10

well you can look at it as

from the 1st equation then b = a/3 from the 2nd b = 7c

so a/3 = 7c

or a = 21c

so a + b = 21c + 7c

b + c = 7c + c

so (a +b)/(b+c) = 28c/8c
= 3.5