Solution: If Raj got all 20 questions right, he
would have gotten 100 points. The difference between 100 points and 60 points is
40 points. For each question, the difference between getting it right and wrong
is 8 points. Therefore Raj got 5 questions wrong. 40/8=5
Free challenging math problems for Kids (1st grade, 2nd grade, 3rd grade, 4th grade, 5th grade, 6 grade and 7th grade)