Mathematics

Linear Equations in One Variable

Question:

frac { 5x }{ 2x-1 } =2

Answer:

ncert-exemplar-problems-class-8-mathematics-linear-equations-in-one-variable-10

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Linear Equations in One Variable

Q 1.

When 9 is subtracted from the product of p and 4, the result is 11. The value of p is—-.

Q 3.

If numerator is 2 less than denominator of a rational number and when 1 is subtracted from numerator and denominator both, the rational number in its simplest form is 1/2. What is the rational number?

Q 4.

The share of A when Rs 25 are divided between A and B, so that A gets Rs 8 more than B, is——–.

Q 5.

4 (3p + 2) – 5 (6p – 1) = 2 (p – 8) – 6 (7p – 4)

Q 6.

In a two-digit number, digit in unit’s place is twice the digit in ten’s place. If 27 is added to it, digits are reversed. Find the number.

Q 7.

When a number is divided by 8, the result is -3. The number is——–.

Q 9.

The sum of four consecutive integers is 266. What are the integers?

Q 10.

There are 40 passengers in a bus, some with Rs 3 tickets and remaining with Rs 10 tickets. The total collection from these passengers is Rs 295. Find how many passengers have tickets worth Rs 3?

Q 11.

If  frac { 2 }{ 5 } x-2=5- frac { 3 }{ 5 } x,then x=——-.

Q 12.

The age of A is five years more than that of B. 5 years ago, the ratio of their ages was 3 :2. Find their present ages.

Q 13.

The number of boys and girls in a class are in the ratio 5 : 4. If the number of boys is 9 more than the number of girls, then number of boys is 9.

Q 14.

Two equal sides of a triangle are each 4 m less than three times the third side. Find the dimensions of the triangle, if its perimeter is 55 m.

Q 15.

The value of x, for which the expressions 3x – 4 and 2x + 1 become equal, is
(a) -3 (b) 0
(c) 5 x (d) 1

Q 16.

If –frac { 4 }{ 3 } y = –frac { 3 }{ 4 } then y is equal to
(a)-{ left[ frac { 3 }{ 4 } 
ight] }^{ 2 } (b)-{ left[ frac { 4 }{ 3 } 
ight] }^{ 2 }
(c){ left[ frac { 3 }{ 4 } 
ight] }^{ 2 } (d){ left[ frac { 4 }{ 3 } 
ight] }^{ 2 }

Q 17.

3 years ago, the age of boy was y years. His age 2 years ago was (y — 2) years.

Q 18.

If x is an even number, then the next even number is 2(x +1).

Q 19.

8x-7-3x=6x-2x-3

Q 20.

After 12 years, Kanwar shall be 3 times as old as he was 4 years ago. Find his present age.

Q 21.

The solution of the equation 2y = 5y-frac { 18 }{ 5 } is————.

Q 22.

After 18 years, Swarnim will be 4 times as old as he is now. His present age is——–.

Q 23.

5(x-1)-2(x+8)=0

Q 24.

 frac { 2y-3 }{ 4 } -frac { 3y-5 }{ 2 } =y+frac { 3 }{ 4 }

Q 25.

Sum of the digits of a two-digit number is 11. The given number is less than the number obtained by interchanging the digits by 9. Find the number.

Q 26.

For what value of x is the perimeter of shape 186 cm?
ncert-exemplar-problems-class-8-mathematics-linear-equations-in-one-variable-42

Q 27.

If a and b are positive integers, then the solution of the equation ax = b has to be always
(a) positive (b) negative (c) one (d) zero

Q 28.

A term of an equation can be transposed to the other side by changing its—-.

Q 29.

The denominator of a rational number is greater than the numerator by 10. If the numerator is increased by 1 and the denominator is decreased by 1, then expression for new denominator is——.

Q 30.

Sum of the ages of Anju and her mother is 65 years. If Anju’s present age is y years, then her mother’s age before 5 years is (60 – y) years.

Q 31.

ncert-exemplar-problems-class-8-mathematics-linear-equations-in-one-variable-1

Q 32.

frac { 5(1-x)+3(1+x) }{ 1-2x } =8

Q 33.

frac { x+1 }{ 4 } =frac { x-2 }{ 3 }

Q 34.

Find a number whose fifth part increased by 30 is equal to its fourth part decreased by 30.

Q 35.

Distance between two places A and B is 210 km. Two cars start simultaneously from A and B in opposite directions and distance between them after 3 hours is 54 km. If speed of one car is less than that of other by 8 km/h, then find the speed of each.

Q 36.

For what value of x is the perimeter of shape 77 cm?

ncert-exemplar-problems-class-8-mathematics-linear-equations-in-one-variable-40

Q 37.

Which of the following is a linear expression?
(a) { x }^{ 2 } +1 (b) y + { y }^{ 2 }
(c) 4 (d) 1 + z

Q 38.

9x – ……………….. = – 21 has the solution (- 2).

Q 39.

In the equation 2x = 4 – x, transposing – x to LHS, we get x = 4.

Q 40.

frac { 5x }{ 2x-1 } =2

Q 41.

frac { 8}{ x } =frac { 5 }{ x-1 }

Q 42.

frac { x }{ 5 } =frac { x-1 }{ 6 }

Q 43.

frac { x }{ 2 } -frac { 1 }{ 4 } left( x-frac { 1 }{ 3 } 
ight) =frac { 1 }{ 6 } left( x+1 
ight) +frac { 1 }{ 12 }

Q 44.

3(5x-2)+2(9x-11)=4(8x-7)-111

Q 45.

If 1/2 is subtracted from a number and the difference is multiplied by 4, the result is 5. What is the number?

Q 46.

An employee works in a company on a contract of 30 days on the condition that he will receive Rs 120 for each day he works and he will be fined Rs 10 for each day he is absent. If he receives Rs 2300 in all, for how many days did he remain absent?

Q 47.

Madhulika thought of a number, doubled it and added 20 to it. On dividing the resulting number by 25, she gets 4. What is the number?

Q 48.

The shifting of a number from one side of an equation to other is called
(a) transposition (b) distributivity
(c) commutativity (d) associativity .

Q 49.

In questions 16 to 32, fill in the blanks to make each statement true.
Question. 16 In a linear equation, the——— power of the variable appearing in the equation is one.

Q 50.

Three consecutive numbers whose sum is 12 are——–,————-and———.