Average

Fast trick to find Average

Q1).If the average weight of 14 boys is 61 kg and that of 15 girls is 58 kg .Than find average weight.

formula for Average -

Avergae = xa + yb / x + y

putting the value in formula

= 14 * 61 + 15 * 58 / 14 + 15

= 1724 / 29

= 59.448275862069

Average weight is 59.448275862069


Q2).If 6,8,4 is the number of children and 38,47,30 kg is their average weight respactively , then find the average weight of all the children

formula for Average -

Avergae = xa + yb + zc / x + y + z

putting the value in formula

= 6 * 38 + 8 * 47 + 4 * 30 / 6 + 8 + 4

= 1724 /29

= 404/18

Average weight is 404/18


Q3).If the average weight of 13 women in the company is 44 kg and when the weight man in included ,average become 20 kg then find the weight of man

formula for Average -

Avergae = New average + change in average * No of quantity

putting the value in formula

= 13 + 44 * 20

= 893

Average weight is 893


Q4).If a car covers a distance of 74 km/hr and come back at a speed of 36 km/hr then find the average speed of the car.

formula for Average -

Avergae = 2xy / x + y

putting the value in formula

= 2 * 74 * 36 / 74 + 36

= 5328 /110

= 48 48/110

Average speed is 48 48/110