Question 320688
The trick to this problem is to first re-write it and then multiply by the reciprocal.

(15/2)÷ 10=
(15/2)/10=
(15/2)/(10/1)=

These are equal to each other- just written differently.
Now dividing (15/2) by (10/1) is the same as multiplying (15/2) by (1/10).  In other words, you want to turn the second fraction (the one you want to divide by) upside down (this is called the reciprocal).  1/10 is the reciprocal of 10/1. Then you multiply the first fraction by the reciprocal.

(15/2)/(10/1)=
(15/2)*(1/10)=
(15*1)/(2*10)=
(15/20)=
3/4 (I simplified by dividing the numerator and denominator by 5)

Your answer is a) 3/4.

You will follow these same steps for other fraction problems.