The difference between the costs of two brands is 20 Rs. Ten years ago, the costlier one was thrice as costly as the cheaper one. The present price of the costlier brand is Pick one
A) 30	B) 20	C) 10	D) 40	E) 50
Let their costs of x Rs and (x + 20) Rs respectively.   Then, (x + 20) - 10 = 3(x - 10)   ⇔ x +10= 3x - 30   ⇔ 2x = 40   ∴ Present cost of the costlier person = (20 + 10)= 
<gadget id="calculator">(20 + 10)</gadget>
<output>30</output>
30Rs.   30nswer :Rs.30
<result>A</result>
The difference between the costs of two brands is 20 Rs. Ten years ago, the costlier one was thrice as costly as the cheaper one. The present price of the costlier brand is