By selling $45$ lemons for $Rs.40$, he loses $20\%$. How many should he sell for $Rs.24$ to gain $20\%$ in the transaction?

What is the least number which when divided by $52, 78$, and $117$ leaves remainder $43, 69$ and $108$ respectively?

Sudhir sold a book for $Rs.36$ thereby gained $12\frac{1}{2}\%$ of what he invested. The amount Sudhir invested to purchase the book was?

If $40\%$of a number is equal to two-third of another number, what is the ratio of the first number to the second number?

The least square number which is exactly divisible by $10, 15, 18, 25$ and $30$?

Sum of three consecutive numbers is $2262$. What is $41\%$ of the highest number?

‘Visual’ is related to ‘Light’ in the same way as ‘Audio’ is related to_____.