Prashant and Naveen started working together and complete a work in 24 days. If the efficiency of Prashant increases by  2/5 th and the efficiency of Naveen decreases by  1/5 th, then they completed the same work in 20 days. Find the time in which Naveen can complete the same work alone?

A shopkeeper gives a discount of 20% on marked price of jeans and cost price of another jeans is 20% more than selling price of first jeans. If shopkeeper sold second jeans at 15% profit and selling price of second jeans is Rs. 608 more than selling price of first jeans. Then find marked price of first jeans?

P , Q and R invested different amounts in a business for 4 months, 6 months and 12 months respectively. Q investment was twice of P investment and R investment was 2.5 times of P investment. If at the end of the year, they together received an amount of Rs 11638 as profit, what was Q profit share?

The perimeter of a square is two times of the perimeter of a rectangle. If the perimeter of the square is 112 cm and the length of the rectangle is 18 cm, what is the difference between the area of the rectangle and that of the square?

Milk and water are mixed in a vessel A in the ratio of 5 : 2 and in the vessel B in the ratio 8 : 5.In what ratio should quantities be taken out from the both the vessels to make a mixture in which the milk and water will be in the ratio of 9 : 4?

What will come in place of the question mark (?) in the following number series?

35, 34, 64, 183, 716, ?

What will come in place of the question mark (?) in the following number series?

56,   30,    48,     124,     439,    ?

What will come in place of the question mark (?) in the following number series?

81,    84,     98,     131,     191,     ?

What will come in place of the question mark (?) in the following number series?

474,      236,       116,      55,       23.5      ?

What will come in place of the question mark (?) in the following number series?

12, 3137, 3762, 3887, 3912, ?