Question

The sum of five numbers is 500. The average of the first two numbers is 80 and the third number is 140. What is the average of the last two numbers?

Answer 1

Answer:

100

Step-by-step explanation:

average of 1st two numbers is 80

so sum of 1st two numbers is 160

3rd no. is 140

sum of 1st three numbers=140+160=300

300+last two numbers=500

sum of last two no.=500-300=200

average of last two no.=200/2=100

Answer 2

Answer:

let first two numbers be x

according to question

x+x/2=80

2x/2=80

x=80

third number is 140

let other two numbers y

80+80+140+y+y=500

300+2y=500

2y=500-300

2y=200

y=200/2

y=100