The lengths of the three sides of a right-angled triangle are (x - 1) cm, (x +1) cm and (x + 3) cm, respectively. The hypotenuse of the right-angled triangle (in cm) is:

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? 

Directions: Study the following data and answer the questions. 

The score of students of a class are given as follows :

Number of students whose IQ score is 140 is

The ratio of the square of a number and the inverse of its cube is 243/16807. what is the number?

Amar can do a piece of work in 30 days and Raman can do the same work in 15 days. If both work together, then what percent of the total work will be completed in 4 days?

If three cubes of sides 3 cm, 4.5 m and 5 cm respectively are melted to form a big money, then find the side of the new cube.

Directions: Find the wrong number in the following number series:

141, 156, 147, 162, 153, 165, 159