Question

If ratios of a:b:c = 2:5:7 and 5a+2b-2c=18
Find a+b+c

Answer 1

Answer:

Step-by-step explanation:

a:b:c=2:5:7

a=2x,b=5x,c=7x

Now ,5a+2b-2c=18

5×2x+2×5x-2×7x=18

6x=18

x=3

a=6

b=15

c=21,is it correct