Chain Rule - General Aptitude

Q1:

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

ANS:D -

Rs. yd
x

Cost of x metres = Rs. d.

Cost of 1 metre = Rs. d
x
Cost of y metres = Rs. d y = Rs. yd .
x x