Quantitative Aptitude - Arithmetic Ability Questions

X, Y and Z can do a piece of work in 30,40 and 50 days respectively. All three of them began the work together but Y left 4 days before completion of the work. In how many days was the work completed?

In a class of 66 students there are 33 girls. The average weight of these girls is 61 Kg and average weight of the full class is 66 kgs. What is the average weight of the boys of the class?

Mishti's birthday is on Thursday 27th April. On what day of the week will be Aradhya's Birthday in the same year, if Aradhya was born on 20th October?

If x + 1/x = √13, then 3x(x2-1) equal to

In a class test, a student scored 22 marks out of 25 marks. The students marks in % is :

PQR is a right angled triangle in which PQ = QR. If the hypotenuse of the triangle is 20 cm, then what is the area (in cm2) of the triangle PQR?

The sum of a fraction and 4 times its reciprocal is 13/3. What is the fraction?

If (5/9 of x) ­- (2/5 of 9/4) equals ­ -4/5 then find x.