Problema Solution
Mary is preparing for her college entrance exams. In a practice test, she answered 12 problems in 30 minutes. At this rate, how many questions can she expect to answer in 150 minutes?
Answer provided by our tutors
x = 12
x.y = 30
12.y = 30
y = 30/12
y = 2.5
x.y = 150
x.2.5 = 150
x = 150/2.5
x = 60