Which one of the following numbers is not a square of any natural number ?

The total number of 3 digit numbers which have two or more consecutive digits identical is:

$$999\,\frac{1}{7} + 999\frac{2}{7} + 999\frac{3}{7} + $$     $$999\frac{4}{7} + $$   $$999\f…

If sum of the two number is 80 and ratio is 3 : 5, then find numbers :

Three-fifth of a number is equal to 70% of another number. What is the ratio between the first number and second number …

The sum of three consecutive natural numbers each divisible by 5, is 225. The largest among them is ?

5358 × 51 = ?

Find the remainder when 73 × 75 × 78 × 57 × 197 × 37 is divided by 34.