Square root, percentage, ratio and proportion, use of log table

The ratio of incomes of two persons is 9 : 7 and the ratio of their expenditures is 4 : 3. If each of them manages to save Rs. 2,000 per month, their monthly incomes are

If two positive numbers are in the ratio 3 : 5 and their least common multiple is 105, then the numbers are respectively

Which of the following cannot be a perfect square?

The smallest number, by which 9408 must be multiplied so that the product is a perfect square, will be

Neha bought a cooler for ₹ 3,300 including a tax of 10%. Then the price of the cooler before tax is :

x is 9 times greater than y. By what percentage is y less than x ?

An electric pole, 14 metres high, casts a shadow of 10 metres. What will be the height of a tree that casts a shadow of 15 metres under similar conditions ?

If $\frac{16}{28} = \frac{x}{21} = \frac{28}{y}$ then the values of x and y are respectively:

Which of the following proportion is not correct?

The value of $\frac{\log 128 - \log 8}{\log 4}$ is: