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Aptitude - Chain Rule - Discussion

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"Do not wait for leaders; do it alone, person to person."
- Mother Teresa
2.

If the cost of x metres of wire is d rupees, then what is the cost of y metres of wire at the same rate?

[A].
 Rs. xy d
[B]. Rs. (xd)
[C]. Rs. (yd)[D].
 Rs. yd x

Explanation:

Cost of x metres = Rs. d.

 Cost of 1 metre = Rs. d x

 Cost of y metres = Rs. d . y = Rs. yd . x x

 Miyyapuram said: (Tue, Jan 18, 2011 12:54:52 PM) for x metres the cost is drupees den x------>d y------>? den y*d/x=ans(cross multiply)

 Divya said: (Sat, Jul 16, 2011 05:07:54 AM) If the cost of x meters is d. then cost of one meter will be d/x. then if we have to find the cost of y meters we have to multiply the y with cost for one meter. thus it is y*d/x.

 Deepa said: (Mon, Sep 10, 2012 01:53:53 PM) Cost of x meters is d. Cost of 1 meters is d/x. Then cost of why meters is d*y/x.

 T.Rajesh said: (Sat, Sep 22, 2012 03:00:44 PM) for X:d::Y:p then p is Xp =Yd p =Yd/X