The average number of eggs sold on monday tuesday and wednesday in a shop was 43 the average for tuesday wednesday and thursday was 45 on thursday the sale was 42 find sale on monday
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The sale on Monday is 39.
The sale of Thursday is 42
The average sale of Tuesday, Wednesday, Thursday= 45
So total sale on Tuesday, Wednesday, Thursday= 45*3 = 135
Also, total sale of Tuesday and Wednesday only = 135-45 = 90
Average sale on Monday, Tuesday, Wednesday= 43
So the total sale on Monday, Tuesday, Wednesday= 43*3= 129
Therefore, sale on Monday only = 129-90 = 39.
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