If no student brought more than Rs. 500 while 4 students brought Rs. 450, how many students brought Rs. 150?
Explanation:
Consider the solution to first question of this set.
Amounts of 150 and 450 are multiples of 30 and 50 but not 20. Hence, they belong to only B and C. Since, maximum amount students brought is 500, hence the 8 students belonging to only B and C must have brought either Rs. 150 or Rs. 450.
If 4 students brought Rs. 450, hence 12 - 4 = 8 students brought Rs. 150.
Hence, 8.
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