in 10 years, a will be twice as old 5 as b was 10 years ago. if a is now 5 years older than b, the present age of b is	Choose the correct answer:
A) 35
B) 37
C) 39
D) 41
E) 42
<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<gadget id="calculator">5 + 10</gadget>
<output>15</output>

<gadget id="calculator">20 + 15</gadget>
<output>35</output>

<result>A</result>
in 10 years, a will be twice as old 5 as b was 10 years ago. if a is now 5 years older than b, the present age of b is
add(multiply(const_2, 10), add(5, 10))
"explanation : let b ' s age = x years . then , as age = ( x + 5 ) years . ( x + 5 + 10 ) = 2 ( x — 10 ) hence x = 35 . present age of b = 35 years answer : option a"