Answer:
1. 50/1 or 50 (other answer is 16 2/3, see explanation to see what I mean)
2. 120/12 or 10
3. 3/10
Explanation:
1. 10 ÷

Convert 10 into a fraction
÷
=
x
=
or 50
(I think you did a Typo and accidentally said three fifths but im going to put it here in case.)
10 Divided by

Convert 10 into a fraction
÷
=
x
=
or 16

2. 3
÷
Convert 3
into a improper fraction
3
=

Then Divide
÷
=
x
=
or 10
3.
÷
÷

Turn it into a multiplication problem by turning the multiplier into a reciprocal
x
=
Hope this helps!