(0.85 % of 405 ) + (2.25 % of 550 )=?

$$ {4\over 7}×{2{4\over 5}} ÷{2\over 5}=?$$

On dividing 256a²b²c² by 64a², we get

Two students appeared for an examination. One of them secured 24 marks more than the other and his marks were 65% of the sum of their marks. The marks obtained by them are _____ .

On a certain Principal if the Simple interest for two years is Rs 4800 and Compound interest for the two years is Rs 5088, what is the rate of Interest?

Rehman walks at 8 km/hr and Roma cycles at 13 km/hr towards each other. What was the distance between them when they started if they meet after 36 minutes?

A can do a work in 15 days and B in 9 days. If they work on it together for 5 days, then what fraction of work is left?

The value of x for which the expressions 7x + 13 and 13x - 7 become equal is _____ .