question_answer

The odds against a husband who is 50 years old, living till he is 70 are 7:5 and the odds against his wife who is now 40, living till she is 60 are 5 : 3. Find the probability that the couple will be alive 20 years hence.

A)  \[\frac{21}{32}\]       

B)  \[\frac{5}{32}\]          

C)  \[\frac{15}{32}\]                      

D) \[\frac{12}{32}\]