5 years ago, the average age of a and b was 15 years. average age of a, b and c today is 20 years. how old will c be after 14 years?  Choose the correct choice:
A) 30
B) 34
C) 40
D) 50
E) 60
<gadget id="calculator">20 * 3</gadget>
<output>60</output>

<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<gadget id="calculator">30 + 5</gadget>
<output>35</output>

<gadget id="calculator">35 + 5</gadget>
<output>40</output>

<gadget id="calculator">60 - 40</gadget>
<output>20</output>

<gadget id="calculator">20 + 14</gadget>
<output>34</output>

<result>B</result>
5 years ago, the average age of a and b was 15 years. average age of a, b and c today is 20 years. how old will c be after 14 years?
add(subtract(multiply(20, const_3), add(add(multiply(15, const_2), 5), 5)), 14)
explanation : ( a + b ) , five years ago = ( 15 * 2 ) = 30 years . ( a + b ) , now = ( 30 + 5 * 2 ) years = 40 years . ( a + b + c ) , now = ( 20 x 3 ) years = 60 years . c , now = ( 60 - 40 ) years = 20 years . c , after 14 years = ( 20 + 14 ) years = 34 years . answer : b