Question

Of the qmb students who use the study guide 60% get high grades. 15% of the qmb students use the study guide and receive high grades. What percent of the qmb students use the study guide? Selected answer: incorrect [none given] correct answer: correct 25%

Answer 1

Let x be the percent of qmb students who uses study guide.

Since we are given that out of the qmb students who use the study guide, 60% get heigher grades, out of x %, 0.6x will get higher graded.

But given 0.6x = 15

x=
`(15)/(0.6)  = 25`