If $$ {66{2\over 3}}{ \%}$$ of 75 % of one-eighth of a certain number is 179, then $$ {33{1\over 3}}{ \%}$$ of three – fourth of that number is:

A wall is the form of a trapezium with height 8 m and parallel sides being 5 m and 10 m. What is the cost of painting the wall, if the rate of painting is Rs. 50 per square meter  ?

A 1.6 m tall observer is 45 metres away from a tower. The angle of elevation from his eye to the top of the tower is 30 °, then the height of the tower in metres is ( Take √3 = 1.732 ) 

If the cost price of 28 items is equal to the selling price of 21 items, what is the profit percentage?

A plan flies a distance of 1800 km in 5 hours. What is its average speed in meters/second?

If 999x + 888y = 1332 and 888 x + 999y = 555.then the value of (x + y) is-

The ratio of the areas of two circles is 16: 25. What will be the ratio of their circumferences?

A car reaches its destination in time when moving with an average speed of 45 km/hr. But when it is moving at 30 km/hr, it is late by 10 minutes. Find the total distance of the journey?