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CTET Maths MCQ - Algebra

21 If 35 is subtracted from a number reduces to its 80%. What is 4/5th of that number?

Let the number be x.
Then,x- 35= (80/100)x
x-(4/5)x = 35 ⇒ x/5 = 35 ⇒ x = 175
Now, 4/5 of x = 4/5 × 175 = 140

22 A number is first increased by 10% and then decreased by 10%, then the number

Let the number be 100. After increasing by 10%, the number = 110% of 100 = 110 . After decreasing by 10%, the number = 90 % of 110 = 99 . Decrement in number = 100 -99 = 1 . Percentage decrease = (Decrease in number / Original number ) x 100% = (1/100) x 100% = 1%

23 There are 1240 employees in an organization out of which 25% are promoted. How many such employees are there who got promotion?

Number of employees who get promoted = 25% of 1240 =(25 x 1240)/100 = 310

24 A person bought a bike in 75000 Rs. But because of some reasons, he had to sell it at a loss of 15%. What is the SP of the bike?

CP = 75000 Rs. Loss percentage = 15% . SP = (100 -15)% of 75000 . = 85/100 x 75000 = 63750 Rs

25 A camera is sold for 4600Rs. If it was sold at a profit of 15%, what was its CP?

CP = ( 100/(100 + profit %) ) x SP = 100/115 x 4600 = 4OOO

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Question:

A sum of money becomes triple of itself in 8 yr at SI. In twelve years, it will become how many times of itself at the same rate?

A. 6 times
B. 4 times
C. 5 times
D. None of the above

Correct answer: B

Explanation:

Since, the sum becomes three times in 8 yr. ∴3P - P = (P x R x 8)/100 =>2 = 8R/100. R= 200/8 = 25%. Again, in 12…

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