4.) Kim has three times as many books as Jane. Together they have 40 books. How many books does Jane have?
a.) 30
b.) 3
c.) 10
d.) 20

C.) 10

Step-by-step explanation:

x=number of books jane has

3x=number of books kim has because she has 3 times as many as jane

3x+x=40    together they have 40 books so you just add them

4x=40    simplify by adding 3x+x

x=10      find x by dividing 40 by 4

D

Step-by-step explanation:

D is the answer because:

We know -

Kevin saved $20\$ 20$20 per week more than Christy.