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8. Quadratic Equations
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Q1 of 242 Page 9

Ashu is x years old while his mother Mrs. Veena is x2 years old. Five years hence Mrs. Veena will be three times old as Ashu. Find their present ages.

Given, Ashu is x years old while his mother Mrs. Veena is x2 years old.


After 5 years, Mrs. Veena will be three times old as Ashu.


⇒ x2 + 5 = 3(x + 5)


⇒ x2 – 3x – 10 = 0


⇒ x2 – 5x + 2x – 10 = 0


⇒ x(x – 5) + 2(x – 5) = 0


⇒ (x + 2)(x – 5) = 0


⇒ x = 5 km/hr


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13

While boarding an aeroplane, a passenger got hurt. The pilot showing promptness and concern, made arrangements to hospitalize the injured and so the plane started late by 30 minutes to reach the destination, 1500 km away in time, the pilot increased the speed by 100 km / hr. Find the original speed / hour of the plane.

14

A motorboat whose speed in still water is 18 km/hr takes 1 hour more to go 24 km upstream that to return downstream to the same spot. Find the speed of the stream.

2

The sum of the ages of a man and his son is 45 years. Five years ago, the product of their ages was four times the man’s age at the time. Find their present ages.

3

The product of Shikha’s age five years ago and her age 8 years later is 30, her age at both times being given in years. Find her present age.

Questions · 242
8. Quadratic Equations
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