Let y be the total number of the bike that are produced
let x be the number of hours
equation:
y = 15x
That'd be 32 with no remainder.
Let "x" be a substitute for "a number"
1/3(x)=x-12 Multiply by 3
x=3x-36 Get n onto the same side of the equation
2x=36 Divide by 2
x=18
That's your answer.
