Answer:
420 x .1 = 42
420 + 42 = 462
400 x .2 = 80
400 + 80 = 480
The first one is cheaper
This value of x will make equation true
Step-by-step explanation:
Given as ;
3x - = 7x -
I,.e - = 7x - 3x
Or, = 4 x
∴ x=
Hence this value of x will make equation true Answer