A man, a woman and a boy can complete a job in 3, 4 and 12 days respectively. How many boys must assist 1 man and 1 woman to complete the job in $$1\over4$$  of a day?

A can cultivate $$2\over5$$ th of a land in 6 days and B can cultivate $$1\over3$$  of the same land in 10 days. Working together A and B can cultivate of $$4\over5$$  the land in;

On what sum does the difference between the compound interest and the simple interest for 3 years at 10 % is Rs 31?

By mistake instead of dividing Rs.117 among A,B and C in the ration $${1\over2}:{1\over3}:{1\over4} $$. it was divided in the ratio of 2:3:4. Who gains the most and by how much?

The ratio of two numbers is 3:8 and their difference is 115. The smaller of the two numbers is:

The length of two chords AB and AC of a circle are 8 cm and 6 cm and ∠BAC=90º, then the radius of circle is

In a regular polygon, the exterior and interior angles are in the ration 1:4.The number of sides of the polygon is

The greatest value of $$ Sin^{4}θ+Cos^{4}θ $$ is: