1) 18% of 45 + 5% of 28

What is the unit digit of the product 21 × 22 × 23 × 24 × ... × 29?

By which numbers is 7^6n - 6^6n, where n is an integer >0, divisible?

Find a positive number which when increased by 17 is equal to 60 times the reciprocal of the number.

The sequence 2, 1, (1/2), (1/4), ... is an example of a:

Find the Compound Interest (C.I.) on Rs. 5,000 at 4% p.a. compounded half-yearly for 1 1/2 years.

A circular wire of radius 21 cm is bent to form a rectangle. The sides of the rectangle are in the ratio 8:3. Find the area of the rectangle in cm^2.

What is the market value of each share if a person buys Rs. 20 shares paying 9% dividend and the person wants to have an interest of 12% on their money?

Solve the following quadratic equations and determine the relationship between the values of x and y:

I. x² + 3x - 18 = 0
II. y² + y - 30 = 0