Question

Karen makes 5 dollars per hour babysitting and 12 dollars per hour giving music lessons. One weekend, she worked a total of 18 hours and made 139 dollars. How many hours did she babysit that weekend

Answer 1

Music lessons: 7 hours x £12 = £84
Babysit: 11 hours x £5 = £55

£84 + £55 = £139

So she babysit for 11 hours on weekend.

Answer 2

15.06

Explanation:

Substituting this value into the first equation gives us b + 2.94 = 18, so b = 15.06 hours. Since Karen can only work whole hours, she must have worked 15 hours babysitting and 3 hours giving music lessons.