How many hours did Jade work on Friday if she charges $5.50 a hour on friday and $7 dollarson Saturday

Question

jade babysits every and . on Friday she charges $5,50 per hour.on Saturday she charges $7 per hour. She worked a total of 12 hours and earned 78. How many hours did she work on Friday

Answer 1

f + s = 12

5.5f + 7s = 78

 

f = 12 - s

5.5(12 - s) + 7s = 78

66 - 5.5s + 7s = 78

1.5s = 12

s = 8

 

f = 12 - 8

f = 4

 

She worked 4 hours Friday and 8 on Saturday.