Question

On a standardized test, Rall answered the first 22 questions in 5 minutes. There are 77 questions on the test. If he continues to answer questions at the same rate, how long will it take them to complete the test from start to finish?

Answer 1

Data:
Questions = 77
Anwered = 22
Missing = 77 - 22 = 55

Solving:

Questions ________ Time
22 -------------------------- 5
55 -------------------------- t

Multiply cross:

$22*t = 55*5$
$22t = 275$
$t = \frac{275}{22}$
$\boxed{t = 12,5minutes}$