Question

Given A+B-C+100=340.if A=2B and B=2C,then C equals?

Answer 1

A+B-C+100=340
2B+2C-C+100=340
4C+C=340-100
5C=240
C=240÷5
=48

HOPE IT HELPS

Answer 2

A+B-C+100=340

GIVEN THAT,
A=2B
B=2C

TO FIND
C=?

we can substitute the values of A and B
2B+2C-C+ 100=340
2B+C+100=340 ...........................(1)
2B+C=340-100
2B=240-C

substituting the value of 2B in 1
240-C+100+340=0
680-C=0
-C= -680
so negative sign gets cancelled
C= 680