1 Crore+ students have signed up on EduRev. Have you? |
A two-digit number is such that the product of the digits is 8. When 18 is added to the number, then the digits are reversed. The number is:
ANSWER :- b
Solution :- Let the two numbers be x and y respectively.
According to the question :
xy = 8 _______(i)
10x + y + 18 = 10y + x
=> 10x - x + 18 = 10y - y
=> 9(x + 2) = 9y
=> x + 2 = y ______(ii)
Putting the value y in equation (i) we get,
x(x + 2) = 8
=> x² + 2x - 8 = 0
=> x² + 4x - 2x - 8 = 0
=> x(x + 4) - 2(x + 4) = 0
=> (x - 2) (x + 4) = 0
=> x = 2 or - 4
Putting the positive value of x in equation (ii),
2 + 2 = y = 4
Hence, The number is : 2 × 10 + 4 = 20 + 4 = 24
What fraction of these circles have X's in them?
Write the fraction representing the shaded region in the below figure.
What is the fractional form of five eighteenths?
The fractional form of five eighteenths
= 5/18
Write the fraction representing the shaded portion.
Fractions with same denominators are called ________.
Like Fractions: The fractions having the same denominators are known as like fractions. We know that fractions such as 2/5, 3/5, 5/5, 7/5, 9/5, …. etc., are like fractions.
Give a proper fraction whose denominator is 7 and numerator is
In a proper fraction the ___________ shows the number of parts which have been considered.
Write the natural numbers from 102 to 113. What fraction of them are prime numbers?
Natural numbers from 102 to 113: 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113
Prime numbers from 102 to 113: 103, 107, 109, 113
Hence fraction of prime numbers = 4/12 = 1/3
A _________ means a part of a group or of a region.
Fractions with not same denominators are called ________.
Write the fraction representing the shaded region in the below figure
228 videos|273 docs|43 tests
|
Use Code STAYHOME200 and get INR 200 additional OFF
|
Use Coupon Code |
228 videos|273 docs|43 tests
|
|
|
|
|
|
|
|
|
|