15 3/5 - 3 2/7 = ?

A. 12 31/35
B. 12 11/35
C. 11 21/35
D. 11 1/35

In the diagram, the ratio of ab to ae is (1/2) . what is the ratio of the length of to the length of ?

Adrawer contains 12 identical white socks, 18 identical black socks and 14 identical brown socks. what is the least number of socks you must choose, without looking, to be certain that you have chosen two socks of the same colour?

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. what distance from city a is the point where the truck and the car will meet?