The average of seven numbers is 20. If 2 is subtracted from each number, then what will the new average be?
Answer & explanation
Correct answer: option 4
Sum of 7 numbers = 7 × 20 = 140
New sum = 140 - 7 × 2 = 140 - 14 = 126
Average = \(\frac{126}{7}\) = 18