# Average

**Fast trick to find Average**

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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 **

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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}

= 40^{4}/_{18}

**Average weight is 40**^{4}/_{18}

^{4}/

_{18}

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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 **

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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}

^{48}/

_{110}