if $$\sqrt { 11- 3\sqrt { 8}}=a+b\sqrt { 2}$$, then what is the value of (2a+3b)?

6 kg sugar costing Rs. 10/kg is mixed with 4 kg sugar costing Rs. 15/kg. What is the average cost of the mixture per kilogram?

If a^2x+2=1, where a is a positive real number other than 1, then x is equal to 

The greatest four digit number which is exactly divisible by each one of the numbers 12, 18, 21 and 28.

The speed of two trains are in the ratio 6 : 7. If the second train covers 364 km in 4 hours, then what is the speed of the first train?

4 boys and 3 girls spent Rs. 120 on an average, of which boys spent Rs. 150 on the average. Then the average amount spent by the girls is.

What can be the maximum number of common tangent, which can be drawn to two non-intersecting circles? 

The average monthly savings of Shifa for the first 5 months is Rs. 2120, for the next 3 months is Rs. 4260 and for the remaining months of the year is Rs. 3140. Now, the average monthly expenditure for the complete year is Rs. 11000. Find the total income of the year