Free Algebra Subjective Test 02 Practice Test - 6th grade
Question 1
Write the given statement in algebraic form "28 more than twice of x is equal to 45." [1 MARK]
SOLUTION
Solution : Solution: 1 Mark
The algebraic form of the given statement is 2x+28=45
Question 2
Subtract: [2 MARKS]
(i) 3a−4b+5c from 4a−b+6c
(ii) 5a−3b+2c from a−4b−2c
SOLUTION
Solution : Solution: 1 Mark each
(i) (4a−b+6c)−(3a−4b+5c)
= 4a−b+6c−3a+4b−5c
= 4a−3a−b+4b+6c−5c
= a+3b+c
(ii) (a−4b−2c)−(5a−3b+2c)
= a−4b−2c−5a+3b−2c
= a−5a−4b+3b−2c−2c
= −4a−b−4c
Question 3
Kimmy went to play with her friends. If Kimmy rolls a die, say 13 times, her score will be the addition of all the numbers appearing on the die each time. Kimmy got 'a' 2 times, 'b' 5 times and 'd' 6 times. What is the total score of Kimmy? [2 MARKS]
SOLUTION
Solution :Concept: 1 Mark
Solution: 1 Mark
Total score of Kimmy =2a+5b+6d
Question 4
A number is decreased by 15 and the new number so obtained is multiplied by 3; the result is 81. Find the number. [3 MARKS]
SOLUTION
Solution : Equation: 1 Mark
Steps: 1 Mark
Answer: 1 Mark
Let the number be x.
The number decreased by 15 ⇒(x−15)
The number so obtained is multip[lied by 3 ⇒3×(x−15)
Given: 3(x−15)=81⇒3x−45=81
⇒3x=81+45
⇒x=1263=42
∴ The required number = 42
Question 5
Find the value of 'x'. [3 MARKS]
(i) 4x+5=25
(ii) x−213=512
(iii) (7x+8)÷7=8
SOLUTION
Solution :Each Option: 1 Mark
(i) 4x+5=25
⇒4x=25−5
⇒4x=20
Divide by 4 on both sides,
4x÷4=20÷4
x=5
(ii) x−213=512
⇒x−73=112(Taking LCM of 1 and 3 )
⇒3x−73=112
⇒3x=112×3+7
⇒3x=33+142=472
⇒x=476=756=7.833
(iii) (7x+8)÷7=8
⇒7x+87=8
⇒7x=8×7−8=56−8=48
⇒x=487=667=6.86
Question 6
The nth term in a pattern is 2n2+5. What is the difference between 6th and 4th terms in the pattern? [3 MARKS]
SOLUTION
Solution : 6th: 1 Mark
4th: 1 Mark
Answer: 1 Mark
Given that, nth term is 2n2+5
Therefore,
6thterm=2×62+5
=2×36+5=77
4thterm=2×42+5
=2×16+5=32+5=37
Difference=77–37=40.
Question 7
If x=2,y=5 and z=4 Find the value of: [4 MARKS]
(i) x2x2
(ii) xzyz
(iii) zx
(iv) yx
SOLUTION
Solution : Each option: 1 Mark
(i) x2x2=12x=12(2)=14
(ii) xzyz=xy=25
(iii) zx=42=16
(iv) yx=52=25
Question 8
Translate each of the following statements into an equation, using x as the variable: [4 MARKS]
a) 13 subtracted from twice a number gives 3.
b) One fifth of a number is 5 less than that number.
c) Two-third of number is 12.
d) 9 added to twice a number gives 13.
SOLUTION
Solution : Each option: 1 Mark
(a) Let the number be x
Twice of number =2x
According to question, 2x−13=3
(b) Let the number be x
One-fifth of number =x5
According to question,x5=x−5
(c) Let the number be x
Two-third of number =2x3
According to question, 2x3=12
(d) Let the number be x
Twice a number =2x
According to question, 2x+9=13
Question 9
The income of a man A is twice the income of B. The income of B is thrice of that of C. Given that the sum of income of A, B and C is ₹72000, find the income of A, B and C? [4 MARKS]
SOLUTION
Solution : A's Income: 1 Mark
B's Income: 1 Mark
C's Income: 1 Mark
Steps: 1 Mark
Let the income of C = ₹ x
Income of B = ₹ 3x
Income of A = twice of income of B = 2(₹ 3x) = ₹ 6x
Sum of their income
⇒10x=72000⇒x=₹ 7200
Income of C
= ₹ x = ₹ 7200
Income of A
=₹ 6x=₹ 6×7200=₹ 43200
Income of B
=₹ 3x=₹ 3×7200=₹ 21600
Question 10
(i) Given that a printer prints 5 pages less in the second minute to what it prints in the first minute. Given that it prints 77 pages in two minutes, how many pages does it print in the first minute?
(ii) The length of a rectangle is 4 metres less than three times the breadth of the rectangle. Express the breadth in terms of length. [4 MARKS]
SOLUTION
Solution :Each option: 2 Marks
(i) Let the number of pages printed in first minute =x
Number of pages printed in the second minute =x−5
Total number of pages printed in the first two minutes =x+x−5
⇒2x−5=77
⇒2x=77+5
⇒2x=82
⇒x=41
(ii) Let L and B be length and breadth of the rectangle respectively
Given L = 3B - 4
Adding 4 to both sides
L+4 =3B -4 + 4
L + 4 = 3B
Dividing both sides by 3, we get,
B=L+43