Exam Maths Puzzle Numerical Ability Simple & Compound Interest

A sum of money was deposited at a compound interest at a certain rate. If simple interest instead
of compound interest had been calculated, then the interest for the first two years would have
decrease by 20 and that for the first three years by 61. What was the sum that was deposited?

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Exam Other Question

What is the probability of getting 52 sundays in a leap year Two vessels contain spirits of concentrations 50% and 75% respectively. If two litres from the first vessel and three litres from the second vessel are mixed, then what will be the ratio of spirit to water in the resultant solution?
Option
(a) 15 : 17
(b) 7 : 17
(c) 13 : 7
(d) 17 : 15