An article is sold at 25% profit. If its cost price and selling price are increased by Rs. 20 and Rs. 4 respectively, then the profit decreases by 10%. The cost price (in Rs.) of that article is

If the HCF of the expressions (x + 3) (2x² – 3x + a) and (x – 2) (3x² + 10x – b) is x² + x – 6, then what is the value of (2a – 3b) ?

The sum of two numbers is 1580 and their LCM is 18816. Find the two numbers.

Reduce $$\frac {295} {565}$$​ to lowest form using HCF

Find the HCF of 3/4, 5/6, 7/8.