Answer: 1/3
There are C(4,2) = 6 ways to choose a pair of numbers. Only 2 of those pairs are supplementary measures {22, 158} and {62, 118}. The probability is 2/6 = 1/3.
Answer: d or b
Step-by-step explanation:
Since you're looking for the unit rate, you can start do this:

And yes,

is also correct, it's just switching around the 15