Quantitative Aptitude - Arithmetic Ability Questions

Which of the following is not a Triangular number?

If the length of one side and the diagonal of a rectangle are 5 cm and 13 cm respectively, then find its perimeter (in cm).

The base of a triangle is half the base of a parallelogram having the same area as that of the triangle. The ratio of the corresponding heights of the triangle to the parallelogram will be

Select the odd word/letters/number/number pair from the given alternatives.

The slope of the line passing through the points (7,-2) and (x,1) is -3/10. Find x.

Determine the value of 'x' in x = 11+2+12+3+13+2

A person purchased 10 shirts costing Rs 150 per shirt. Next day  he again purchased the shirts costing Rs 150 per shirt at a discount of Rs 30 per shirt and that day he spent a toal of Rs 1800. What is the average cost per shirt (in Rs)?

Three consecutive natural numbers are such that the square of the greatest is greater than the product of the other two by 19. The smallest of these numbers is