the avg weight of a, b & c is 55 kg. if d joins the group, the avg weight of the group becomes 60 kg. if another man e who weights is 3 kg more than d replaces a, then the avgof b, c, d & e becomes 58 kg. what is the weight of a?  Choose the correct option.
A) 56 B) 65 C) 75 D) 86 E) 90
<gadget id="calculator">60 * 4</gadget>
<output>240</output>

<gadget id="calculator">58 * 4</gadget>
<output>232</output>

<gadget id="calculator">55 * 3</gadget>
<output>165</output>

<gadget id="calculator">240 - 165</gadget>
<output>75</output>

<gadget id="calculator">3 + 75</gadget>
<output>78</output>

<gadget id="calculator">232 - 78</gadget>
<output>154</output>

<gadget id="calculator">240 - 154</gadget>
<output>86</output>

<result>D</result>
the avg weight of a, b & c is 55 kg. if d joins the group, the avg weight of the group becomes 60 kg. if another man e who weights is 3 kg more than d replaces a, then the avgof b, c, d & e becomes 58 kg. what is the weight of a?
subtract(multiply(60, const_4), subtract(multiply(58, const_4), add(3, subtract(multiply(60, const_4), multiply(55, 3)))))
"a + b + c = 3 * 55 = 165 a + b + c + d = 4 * 60 = 240 - - - - ( i ) so , d = 75 & e = 75 + 3 = 78 b + c + d + e = 58 * 4 = 232 - - - ( ii ) from eq . ( i ) & ( ii ) a - e = 240 – 232 = 8 a = e + 8 = 78 + 8 = 86 answer : d"