In 6 days of a week, 250 boys attended for the first four days and 260 boys for the last three days. The average attendance in this week is 255. The number of students present on Thursday was ?
Average attendance in 6 days = 255
=> Total boys attended in 6 days = $$255\times6=1530$$
Similarly, total boys attended in first 4 days = $$250\times4=1000$$
Total boys attended in last 3 days = $$260\times3=780$$
=> The number of students present on Thursday = $$(1000+780)-1530=250$$
=> Ans - (B)
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