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Question Detail
Evaluate 28% of 450 + 45% of 280
 232
 242
 252
 262
Answer: Option C
Explanation:
= (28/100) * 450 + (45/100) * 280
= 126 + 126 = 252
1. A housewife saved Rs. 2.50 in buying an item on sale. If she spent Rs. 25 for the item, approximately how much percent she saved in the transaction
 9%
 10%
 11%
 12%
Answer: Option A
Explanation:
Actual Price = Rs.25 + Rs.2.50 = Rs.27.5
Saving = Rs.2.5
\begin{aligned}\text{Percentage Saving = }\dfrac{2.5}{27.5}\times 100 \\
= \dfrac{250}{27.5} = \dfrac{2500}{275}\\
= \dfrac{100}{11} = 9\dfrac{1}{11}\% \approx 9\%\end{aligned}
2. 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}
3. 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
4. Total number of boys and girls in a school is 150. If the number of boys is x, then girls become x% of the total number of students. The number of boys is
 50
 60
 70
 80
Answer: Option B
Explanation:
Clearly,
x% of 150 = 150  x [as x is number of boys]
\begin{aligned}
=> x + \frac{x}{100} * 150 = 150 \\
=> \frac{5}{2}x = 150 \\
=> x = 60 \\
\end{aligned}
5. The ratio 5:20 expressed as percent equals to
 50 %
 125 %
 25 %
 None of above
Answer: Option C
Explanation:
Actually it means 5 is what percent of 20, which can be calculated as,
(5/20)*100 = 5 * 5 = 25
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