Aptitude - Chain Rule - Discussion

Discussion :: Chain Rule - General Questions (Q.No.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?

Rs. xy
[B]. Rs. (xd)
[C]. Rs. (yd)
Rs. yd

Answer: Option D


Cost of x metres = Rs. d.

Cost of 1 metre = Rs. d

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

Miyyapuram said: (Jan 18, 2011)  
for x metres the cost is drupees den
den y*d/x=ans(cross multiply)

Divya said: (Jul 16, 2011)  
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: (Sep 10, 2012)  
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: (Sep 22, 2012)  
for X:d::Y:p then p is Xp =Yd
p =Yd/X

Anil said: (Nov 6, 2013)  
x meters--->d rupees.

For 1 meter, we get d/x.

For y meters simply multiply d/x with y.

Parameswaran.G said: (Dec 21, 2013)  
We known X and D,

Then we need Y meters of wire.
Let as,


Rajini said: (Apr 4, 2015)  
We know the cost of x rupees is d meters cost of one meter is d/x cost of y meters is d/x*y.

Kharinagendra said: (Apr 28, 2015)  
X meters.....d rupees.

Y meters......?

Then cross multiplication yd/x.

Manikandan said: (Jul 31, 2015)  
We know cost of x is d then y is using matrix multiplication format.

Nikhil Yamalwar said: (Feb 20, 2016)  
X/d = y/?

suppose ? = p, then cross multiplication.

You will get ans: x*p = yd.

P = (yd/x).

Sundaresh said: (Aug 29, 2016)  
x = 5 meters d = 10rupees
y = 7 then d = ?

10/5 = 2; 2 * 7 = 14.
How to get this mean d/x *y?

Chandrakala said: (May 26, 2019)  
According to me, the answer is xy/d.

Mayank Kumar said: (Jul 3, 2020)  
Thanks everyone for explaining.

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