Multiple choice

The average height of 15 students in a class is 143 cm. If the height of the teacher is added the average increases by 1 cm. What is the height of the teacher? (in cm.)

  1. 157

  2. 163

  3. 159

  4. 162

  5. None of these

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total height of 15 students = 15 × 143 = 2145 cm. With teacher, average = 144 cm for 16 people. Total = 16 × 144 = 2304 cm. Teacher's height = 2304 - 2145 = 159 cm. This matches option C.