What is the value for x in the equation 4x+8y=40 when y=0.8

Nell has a sales clerk job that pays $12 per hour for regular gas work hours. she gets double time for any hours over 40 that she works in a week. how many hours did nell work if her weekly pay was $744

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

The following division is being performed using multiplication by the reciprocal find the missing numbers is 5/12 divided by x/3 equals 5/12 times x/10 equals 1/x