Mathtips

black_arabian_stallion_by_vikarus-d33e5pn

 

Solution for yesterday’s problem

Conventional method

Let ‘t’ be the usual time in minutes

By supposition, 30(t+10)=42(t-10)

=>t=60 minutes

In 60 minutes the man travels 30 km. Therefore, in 70 minutes he will travel 35 km which is the distance he covers to reach the destination.

Other method 1

(30*10+42*10)/(42-30)=60 minutes (usual time)

Other method 2

42-d:d-30::7:5

=>d=35 km

Today’s problem

A man bought two horses for $1440. He sold one at a gain of 15% and the other at a loss of 8% and it was found that each horse fetched him the same amount. Find the cost price of the second horse. (Asked by Preeti)

 

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