Question

85, ?, ?, ?, 145
a.
105, 125, 135
c.
95, 105, 115
b.
100, 115, 130
d.
130, 115, 100

Answer 1

Try checking each one and find out which one seems most reasonable.

Answer 2

it takes 4 "hops" to get from 85 to 145 (count ?, ? , ? , 145)

each hop is the same amount , call it x:
85 + 4x = 145
solve for x
4x= 60
x= 15

now add 15 to 85, and then add 15 again, and so on...