Quantitative Aptitude :: Chain Rule - Discussion

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Explanation:
Lets assume orange, banana and apple cost is x, y and z respectively.
So, 2 orange + 3 banana + 4 apple =(2x+ 3y + 4z) = 15 -------- (1)
and 3 orange + 2 banana + 1 apple) = (3x+2y+z) = 10 ---------(2)

so from eq. (1) and (2)
5 (orange + banana + apple ) = 25
=> (orange + banana + apple ) = 5
so 3 orange + 3 banana + 3 apple = 3 * 5 = Rs. 15