If $$ x=\sqrt{\sqrt{5}+1\over {\sqrt{5}-1}}$$ then the value  of $$ {5x^2-5x-1}$$ will be:

A, B and C enter into a partner ship with capitals in the ratio 5 : 6 :8. At the end of business term, they received the profits in the ratio 5 : 3 :12. Find the ratio of time for which they contributed their capitals?

Pie chart shows the percent of money spent by family on various item during 1999. Study the graph and answer these questions.

The ratio of the total amount of money spent on housing to that spent on education was

An article is sold at a profit of 25 %. If the selling price is doubled, the profit % will be: 

Direction: Study the following table carefully and answer the given questions. Table shows the of passed students in four schools and ratio between passed boys and girls among them. The ratio between failed boys and girls is reverse of passed ratio between them.

If in school P, 100 girls are failed in the exam, then find the total number of students in school P. 

The speed of first train is 45km/hr. and the speed of another train is 10m/sec. find the ratio of their speed?

The ratio of speeds of A is to B is 2:3 and therefore A takes 20 minutes less time than B takes. What is the ratio of time taken by A and B?

A rectangular grass plot 80 m × 60 m has two roads, each 10 m wide, running in the middle of it; one parallel to length and the other parallel to breadth. Find the cost of gravelling the roads at ₹ 2 per m².