Question

The average age of three people running for election is 42. A fourth person joins the race and the average drops to 40. What is the fourth

person's age?
OA. 32
OB. 34
ОО
C. 35
D. 36
E. 40

Answer 1

B. 34

`let \: sum \: of \: ages \: of\: 3 \: people \: be \: x \\ 42 = (x)/(3) \\ x = 126 \\ let \:age \: of \: fourth \: person \: be \: y \\ 40 = (x + y)/(4) \\ 160 = x + y \\ 160 = 126 + y \\ y = 34 \\ = 34 \: years`