In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.
--------
Question: Problem: a ' s speed is 20 / 15 times that of b . if a and b run a race , what part of the length of the race should a give b as a head start , so that the race ends in a dead heat ?
Options: a ) 1 / 17 , b ) 3 / 17 , c ) 1 / 10 , d ) 5 / 20 , e ) 3 / 10

Answer: d

Question: Problem: roy is now 6 years older than julia and half of that amount older than kelly . if in 4 years , roy will be twice as old as julia , then in 4 years what would be roy ' s age multiplied by kelly ' s age ?
Options: a ) 72 , b ) 84 , c ) 90 , d ) 96 , e ) 108

Answer: e

Question: Problem: ? x 40 = 173 x 240
Options: a ) 545 , b ) 685 , c ) 1038 , d ) 495 , e ) 534

Answer:
c