The local skating rink pays mary a fixed rate per pupil plus a base amount to work as a skating instructor. she earns $90 for instructing 15 students on monday afternoon. last friday, she earned $62 for working with 8 students. lisa is also a skating instructor. she receives half the base amount that mary does, but she is paid twice as much per student. who would earn more money instructing a class of 20 students?
lisa would earn $120 more than mary.
lisa would earn $65 more than mary.
mary would earn $15 more than lisa.
mary would earn $10 more than lisa.

The correct option is :

Lisa would earn $65 more than Mary.

Step-by-step explanation:

Let 'b' define base salary of Mary.

Let 'm' define the fee per student.

As per given information, Mary's expressions become:

For Monday:   .... (1)

For Tuesday:     ....(2)

Subtracting (2) from (1) to get the value of m

m = 4

b = 30

So, the complete equation that represents Mary's salary is :

For 20 students, the salary becomes:

= $110

Similarly, Lisa's earnings can be shown as :

So, for 20 students, Lisa's salary is :

= $175

-----------------------------------------------------------------------------------

Now difference between both girl's salary = dollars.

So, the correct option is :

Lisa would earn $65 more than Mary.

hi,

i'm 75% sure the answer is 1,1 to both lines.

have a great day

pay attention in your classes and concentrate the best thing you can do to raise your test scores is to pay attention when you're supposed to be learning the material: in class!

take good notes.

do your homework.

use mnemonics and other tricks.

do practice tests.

note: the best i know.