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Question Detail
Half of 1 percent written as decimal is
- 5
- 0.5
- 0.05
- 0.005
Answer: Option D
Explanation:
It will be 1/2(1%) = 1/2(1/100) = 1/200 = 0.005
1. If number x is 10% less than another number y and y is 10% more than 125, then find out the value of x
- 123.55
- 123.65
- 123.75
- 123.85
Answer: Option C
2. What is 15 percent of 34
- 5.10
- 4.10
- 3.10
- 2.10
Answer: Option A
Explanation:
It will be 15% of 34
= (15/100) * 34 = 5.10
3. Evaluate 28% of 450 + 45% of 280
- 232
- 242
- 252
- 262
Answer: Option C
Explanation:
= (28/100) * 450 + (45/100) * 280
= 126 + 126 = 252
4. Teacher took exam for English, average for the entire class was 80 marks. If we say that 10% of the students scored 95 marks and 20% scored 90 marks then calcualte average marks of the remaining students of the class.
- 60
- 70
- 75
- 80
Answer: Option C
Explanation:
Lets assume that total number of students in class is 100 and required average be x.
Then from the given statement we can calculate :
(10 * 95) + (20 * 90) + (70 * x) = (100 * 80)
=> 70x = 8000 - (950 + 1800) = 5250
=> x = 75.
5. 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}
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