Simple interest on a sum for 5 years is equal to 20% of the principal. In how many years interest will be equal to the principal?
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What is the largest 4 digit number which is exactly divisible by 81?
How many three digit numbers are there in which all the digits are odd?
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If 3x+22x+1 = a2x+1+bx+2 be an identity, then the value of b
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Find the LCM of 12, 16, 20 and 24.
If the compound interest for the 3rd and 4th year on a certain principal is Rs 125 and Rs 135 respectively, what is the rate of interest (in %)?