A’s income is 60% of B’s income, and A’s expenditure is 70% of B’s expenditure. If A’s income is 75% of B’s expenditure, find the ratio of A’s saving to B’s saving?

An article is sold at a profit of 20% of its cost price. If cost price and selling price reduces by Rs 10 and Rs. 5 respectively, then the percentage profit increased to 30%. Find the cost price?

A vendor buys bananas at 12 for 45 and sells at 5 for 35. What will be the gain ? 

What is the value of X ?, if 7580 - X = 3440

The difference between the value of the number increased by 20 % and the value of the number decreased by 25 % is 36. Find the number. 

An Aeroplan is flying horizontally at a height of 1.8 km above the ground. The angle of elevation of plane from point X is 60° and after 20 seconds, its angle of elevation from X becomes 30°, If point X is on ground, then what is the speed (in km / hr.) of Aeroplan? 

What is the value of $$ {2tan53°\over cot37°} -{cot80°\over tan10°}$$ is:

$${3x+4y-2z+9=17},{7x+2y+11z+8=23}$$ and $$ {5x+9y+6z-4=18}$$ then what is  the value of $$ {x+y+z-34}$$?