To mainain 8 cows for 60 days, a milkman has to spend Rs. 6,400. To maintain 5 cows for n days, he has to spend Rs. 4,800. What is the value of n ?

A student has to secure 40% of marks to pass an examination. He gets only 45 marks and fails by 5 marks. The maximum marks are

Five years ago, Ram was three times as old as Shyam. Four years from now, Ram will be only twice as old as Shyam. What is the present age of Ram ?

A boy went to his school at a speed of 12 km/hr and returned to his house at a speed of 8 km/hr. If he has taken 50 minutes for the whole journey, whatwas the total distance walked?

There are 350 boys in the first three standards. The ratio of the number of boys in first and second standards is 2 : 3, while that of boys in second and third standards is 4 : 5. What is the total number of boys in first and third standards?

There are 8 lines in a plane, no two of which are parallel. What is the maximum number of points at which they can intersects?

An arc of a circle subtends an angle π at the centre . If the length of the arc is 22 cm , then what is the radius of the circle?

The diagonals of a rhombus are of length 20 cm and 48 cm. What is the length of a side of the rhombus?

A hollow cube is formed by joining six identical squares. A rectangular cello tape of length 4 cm and breadth 0.5 cm is based for joining each pair of edges. What is the total area of cello tape used?

What is the value of

If,

• A = {x : x is a multiple of 7}
• B = {x : x is a multiple of 5}
• C = {x : x is a multiple of 35}

then which one of the following is a null set ?

• Kx + 3y + 1 = 0
• 2x + y + 3 = 0

The pair of linear equations given above will intersect each other, if

The number of prime numbers which are less then 100 is

In the figure given below, AD = CD = BC. What is the value of ∠CDB ?

If the equations given below have a common root

• x² - px + q = 0
• x² + qx - p = 0

then which one of the following is correct?

7¹⁰ - 5¹⁰ is divisible by

Consider the following

Which of the above is/are identity/ identities?

In the figure given below, p and q are parallel lines. What are the values of the angles x ?

Which of the points P(5, -1), Q( 3, -2 ) and R(1, 1) lie in the solution of the system of inequations x + y ≤ 4 and x - y ≥ 2 ?