Quantitative Aptitude - Arithmetic Ability Questions

What is the unit digit of 15+25+35+...+205 ?

Find the unit place digit in 71 x 72 x 73 x 74 x 76 x 77 x 78 x 79.

If the product of two numbers is 2400 and their LCM is 96 then their HCF is

If x + y = 13 and x2 + y2 = 89, then find xy is

Deepanshu lent Rs. 8400 to Jaipal for 15 years and Rs. 5100 to Kareem for 14 years on simple interest at the same rate of interest and received Rs. 17766 in all from both of them as interest. The rate of interest per annum is

Two cyclists A and B start cycling at 21 km/hr and 24 km/hr towards each other. They meet after 1 hour and 12 minutes. How far (in km) were they from each other when they started?

If secA + tanA = x, then the value of x is

In ΔABC, D and E are points on side AB and AC respectively. DE is parallel to BC. If lengths of AD, DB and DE are 8 cm, 6 cm and 7.2 cm respectively, find length of BC?