if the average marks of 3 batches of 55, 60 and 45 students respectively is 40, 62, 58, then the average marks of all the students is Choose the correct choice:
A) 54.48 B) 53.31 C) 54.6 D) 54.58 E) none of these
<gadget id="calculator">55 * 40</gadget>
<output>2_200</output>

<gadget id="calculator">60 * 62</gadget>
<output>3_720</output>

<gadget id="calculator">2_200 + 3_720</gadget>
<output>5_920</output>

<gadget id="calculator">40 * 58</gadget>
<output>2_320</output>

<gadget id="calculator">5_920 + 2_320</gadget>
<output>8_240</output>

<gadget id="calculator">55 + 60</gadget>
<output>115</output>

<gadget id="calculator">115 + 45</gadget>
<output>160</output>

<gadget id="calculator">8_240 / 160</gadget>
<output>103/2 = around 51.5</output>

<result>B</result>
if the average marks of 3 batches of 55, 60 and 45 students respectively is 40, 62, 58, then the average marks of all the students is
divide(add(add(multiply(55, 40), multiply(60, 62)), multiply(40, 58)), add(add(55, 60), 45))
explanation : ( 55 ã — 40 ) + ( 60 ã — 62 ) + ( 45 ã — 58 ) / 55 + 60 + 45 8530 / 160 = 53.3 option b