Which expression can be used to convert an old grade, g, to the new grade?

Question

An old grading system describes grades from 0 to 10. New grading guidelines require that grades be entered from 50 to 100. 

 

A. 5g

B. g+50

C. g+90

D. 10g-50

E. 5g+50

Answer 1

The original range of numbers is 10-0 = 10. The new range of number is 100-50=50. Since the new range is 5 times the old range, you need to multiply old grades by 5.

The original minimum value is 0. The new minimum value is 50. You need to add 50 to the adjusted grades to get the new range.