15. For 20 students, the mess bill for 1...

15. For 20 students, the mess bill for 12 days is 77000. In how many days will the mess charges be 4900 for 8 students 120 days 2) 21 days 3) 22 days 4) 23 days 16. A number when decreased by 20% becomes 136. What is the member?

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