Find the mean of $5, 16, 15, 18, 9, 1, 13$ .

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Find the compound interest on Rs. 20,000 at $5%$ per annum for $2$ years.
A trader buys an article for Rs. 2,000 and sells it for Rs. 2,600. Find the profit percentage.
A radio is marked at Rs. 20,000. A discount of $25%$ is given and then a tax of $20%$ is added to the discounted price. Find the amount to…
A box contains 7 red and 8 blue balls. Two balls are taken at random without replacement. Find the probability that they are of different co…
Find the lowest common multiple (LCM) of $18$ and $30$ .
In an arithmetic progression the term number $6$ is $25$ and the term number $11$ is $45$ . Find the term number $22$ .