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Find the annual installment that will discharge a debt of Rs 12900 due in 4 years at 5% per annum simple interest.
The difference between Simple Interest & Compound Interest for the fourth year is Rs 7280 at 20% per annum. What is the principal amount.
If cosec39° = x, the value of \({1 \over cosec^251°}+sin^239°+tan^251°-{1 \over sin^2 51°sec^2 39°} \) is
Five men and 2 boys can do as much work in 30 days as 7 men and 10 boys can do in 15 days. How many boys should join 40 men to do the same work in 4 days?
If sin(A+B-C) = cos(A+C-B) = tan(B+C-A), then the value of angle A is