The sum of the present ages of two persons A and B is 60. If the age of A is twice that of B, find the sum of their ages 9 years hence?	Choose the correct choice:
A) 22	B) 77	C) 78	D) 98	E) 71
A + B = 60, A = 2B   2B + B = 60 =&gt; B = 20 then A = 40.   9 years, their ages will be 49 and 29.   Sum of their ages = 49 + 29= 
<gadget id="calculator">49 + 29</gadget>
<output>78</output>
78.   Answer: 78
<result>C</result>
The sum of the present ages of two persons A and B is 60. If the age of A is twice that of B, find the sum of their ages 9 years hence?