Question

Tom received 89,94,86 and 96 on the first four algebra tests . What grade must he receive on his last test to have an average on 92

Answer 1

Tom must score 95 on his last test to have an average of 92.

Explanation:

Tom's average score (92) = the sum of all his five grades/the number of grades (5)

Given that A is the grade Tom must receive on his last test, we have the equation as follows:

92 = (89+94+86+96+A)/5

<=> A = 92 × 5 - (89+94+86+96)

=> A = 95