Question

Let 2a = 3b = 5c If a + b - c = 55 , find c

Answer 1

Answer:

Here, a=5c/2 , b=5c/3

Now, a+b-c =55

Or, 5c/2 +5c/3 -c =55

Or, (15c+10c-6c) /6 = 55

Or, 19c = 55×6

Or, 19c =330

Or, c= 330/19

Answer 2

Answer:

17.368

Step-by-step explanation:

let, 2a = 5c

so a = (5/2) c

and, 3b = 5c

so b = (5/3) c

Now, a + b - c = 55

i.e. (5/2) c + (5/3) c - c = 55

{(5/2) + (5/3) - 1 } c = 55

(19/6) c = 55

c = 55 (6/19)

so, c = 17.368