Mike can stitch 7 shirts in 42 hours. he can stitch 1 shirt in how many hours, and in 1 hour he can stitch how much of a shirt.

Mike can stitch one shirt in 6 hours and in 1 hour he can stitch (0.167) shirts.

Step-by-step explanation:

Mike can stitch 7 shirts in 42 hours

to calculate the time that he takes to make 1 shirt, we have to divide 42 by 7.

He can stitch 1 shirt in = = 6 hours

Now we calculate the work done in one hour.

He can stitch in 1 hour =  shirts or 0.167 shirts

Mike can stitch one shirt in 6 hours and in 1 hour he can stitch shirts.

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so:

(-5,-28)

i graphed to on desmos.