Question

Sue should have finished (28+16x) Mathematics questions in 4 hours.
A)How many questions would have been done in 30 minutes?
B)If Sue could only finish (14+8x) questions, how much time did she spend?

Answer 1

a) 3.5+2x
b)2 hr

workings
a)4 hr= 28+16x
30min= (28+16×)÷8
= 3.5+2x
b) 30min =3.5+2x
(14+8x)÷ (3.5+2x)
=4
30 min ×4 = 2hr