The sum of three integers A, B and C is 240. A is one third of the sum of B and C and B is one fifth of the sum of A and C. What is C?  Choose the correct choice from the following answers:
A) 120
B) 130
C) 125
D) 140
E) 145
A is one third of the sum of B and C..   or A=1/3(B+C)...   But A+B+C=240   so 1/3(B+C)+B+C=240   4(B+C)/3= 240   B+C =240*3/4= 
<gadget id="calculator">240*3/4</gadget>
<output>180</output>
180   A=240-180= 
<gadget id="calculator">240-180</gadget>
<output>60</output>
60   2)B is one fifth of the sum of A and C   or B=1/5(A+C)...   But A+B+C=240   so 1/5(A+C)+A+C=240   A+C=240*5/6= 
<gadget id="calculator">240*5/6</gadget>
<output>200</output>
200   but A=60, so C=200-60= 
<gadget id="calculator">200-60</gadget>
<output>140</output>
140   Answer :140
<result>D</result>
The sum of three integers A, B and C is 240. A is one third of the sum of B and C and B is one fifth of the sum of A and C. What is C?