The half of the average value of three number is 20. The second number is thrice the third number and first number is twice the second number. What is the sum of smallest and largest number?
- A 68
- B 56
- C 84
- D 96
Show answer
Half average 20 ⇒ average 40 ⇒ sum 120. Third z, second 3z, first 6z ⇒ 10z = 120 ⇒ z = 12. Largest 72 + smallest 12 = 84.