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A student multiplied a number by 3/5 instead of 5/3. What is the percentage error.

  • 64%
  • 65%
  • 66%
  • 67%

Answer: Option A

Explanation:

Let the number be x,
then,
\begin{aligned}
\frac{5}{3} - \frac{3}{5} = \frac{16}{15}x
\end{aligned}

Error% = \begin{aligned}
(\frac{16}{15}x * \frac{3}{5} * 100)% = 64%
\end{aligned}

Similar Questions :

1. If x% of y is 100 and y% of z is 200, then find the relation between x and z.

  • z = x
  • 2z = x
  • z = 2x
  • None of above

Answer: Option C

Explanation:

It is , y% of z = 2(x% of y)
=> yz/100 = 2xy/100
=> z = 2x

2. How many litres of pure acid are there in 8 litres of a 20% solution

  • 1.5
  • 1.6
  • 1.7
  • 1.8

Answer: Option B

Explanation:

Question of this type looks a bit typical, but it is too simple, as below...

It will be 8 * 20/100 = 1.6

3. 2 is what percent of 50

  • 2%
  • 4%
  • 6%
  • 8%

Answer: Option B

Explanation:

2/50 * 100 = 1/25 * 100 = 4 %

4. One fourth of one third of two fifth of a number is 15. What will be40% of that number

  • 140
  • 150
  • 180
  • 200

Answer: Option C

Explanation:

(1/4) * (1/3) * (2/5) * x = 15 then x = 15 * 30 = 450
40% of 450 = 180

5. If sales tax is reduced from 5% to 4%, then what difference it will make if you purchase an item of Rs. 1000

  • 10
  • 20
  • 30
  • 40

Answer: Option A

Explanation:

Clue: Answer will be 5% of 1000 - 4% of 1000

Read more from - Percentage Questions Answers
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