Cool if badly worded question. They're called dice. "given than"?
P(sum of two dice is odd GIVEN one is 4)
Of the 36 pairs of dice rolls, eleven have one with a 4:
(4,1),(4,2),(4,3),(4,4),(4,5),(4,6),(1,4),(2,4),(3,4),(5,4),(6,4)
Six of eleven have an odd sum;
Answer: 6/11
20.
The sides of a 45/45/90 triangle are in ratio so each side is
and the area is
Answer: 144