a student gets 55 % in one subject, 65 % in the other. to get an overall of 55 % how much should get in third subject.  Choose one.
A) 75 %
B) 25 %
C) 45 %
D) 55 %
E) 65 %
<gadget id="calculator">55 * 3</gadget>
<output>165</output>

<gadget id="calculator">55 + 65</gadget>
<output>120</output>

<gadget id="calculator">165 - 120</gadget>
<output>45</output>

<result>C</result>
a student gets 55 % in one subject, 65 % in the other. to get an overall of 55 % how much should get in third subject.
subtract(multiply(55, const_3), add(55, 65))
"let the 3 rd subject % = x 55 + 65 + x = 3 * 55 120 + x = 165 x = 165 - 120 = 45 answer : c"