Question

Naila worked 3.5 hours more than Lisa. Together, they worked a total of 18 hours. Lisa worked h hours.

h+7=18

h+3.5=18

h+(h+3.5)=18

h+(h−3.5)=18

Answer 1

Lisa = 7 hours and 15 minutes

Naila = 10 hours and 45 minutes

Explanation:

Naila = N

Lisa = L

Naila worked:

N = 3.5 + L

In total, they worked:

N + L = 18

Lisa worked:

L = h

Substitute values into the total equation

3.5 + L + L = 18

Solve

2L = 14.5

L = 7.25 = 7 hours and 15 minutes

N = 7.25 + 3.5 = 10.75 = 10 hours and 45 minutes

Hope this helps :)