Question
The HCF of two numbers is 56, and their LCM is 1680.
What is the sum of the numbers?Solution
Let the two numbers be 56x and 56y.
Then,
Product of the numbers = Product of HCF and LCM
56x × 56y = 56 × 1680
xy = 30
Let x = 5 and y = 6 (As co-prime factors of 30 are 5 and 6).
Then, the sum of the numbers is
56 × 5 + 56 × 6 = 56 × 11 = 616
A solid non-conducting sphere of radius R carries a uniform volume charge density ρ. What is the ratio of electric field at r = R (surface) to that at ...
What happens to the electrostatic force between two charges when the distance between them decreases?
How long does an image remain on the retina after the object is removed?
The threshold wavelength for a photoelectric surface is 540 nm. Will a light of energy 2.5 eV cause photoemission?
Which lens is used to correct myopia (shortsightedness)?
Which law describes the relationship between the force applied to a spring and its extension or compression?
Which of the following is a reason for excessive current in electrical circuits?
I. Direct touching of wires
II. Connection of many d...
A lens forms an image of magnification -2. If the object is placed 15 cm from the lens, what is the image distance?
A spherical ball made of steel when dropped in mercury container will –
The point where the total mass of a body is considered to be concentrated is known as what?
