It’s estranged that , on any given day, ten thousand species are being given between the world just in the ballast water of our supertankers.

A toy is sold for Rs. 800 at 60% profit when profit is calculated on selling price. Find the profit% on cost price?

Which among the given operators should replace the “%” (in the same order) in the given expression below:

9 % 14 % 9 % 90 % 42 % 15

Select the correct combination of mathematical signs that can sequentially replace the * signs and balance the given equation.

32 * 366 * 6 * 2 * 134 = 20

The given equation has been solved on the basis of a certain rule. Find the correct answer for the unsolved equation on that basis:

In the following question, which mathematical operators can be used so that the expression will become correct?

9 * 6 * 28 * 4 * 30

Select the correct combination of mathematical signs to sequentially replace the * signs and balance the given equation.

65 * 45 * 25 * 5 * 35 * 60

If + means −, − means ×, × means ÷, and ÷ means +, what will be the value of the following expression?

19 ÷ 14 + 8 – 12 × 3

In how many different ways can the letters of the word 'COMPUTER' be arranged in such a way that the vowels always come together?