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The average earning of a mechanic for the first four days of a week is Rs.18 and for the last four days is Rs.22. If he earns Rs.20 on the fourth day, his average earning for the whole week is ?
Rs. 18.95
Rs. 16
Rs. 20
Rs. 25.71
A+B+C+D = 18*4 = 72 ------> (i)
D+E+F+G = 22*4 = 88 -------> (ii)
D = 20 ------> Put this in equ (i) and (ii) :-
A+B+C = 52 -------> (iii)
E+F+G = 68 ------> (iv)
A+B+C+D+E+F+G = 52 + 68 +20 = 140
The required average is :-
140/7 = 20
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