1 Marks Question

Question 11 Mark

$72\%$ of $25$ students are good in mathematics. How many are not good in mathematics$?$

Answer

Number of students who are good in mathematics $=72 \%$ of $25$
$=\frac{72}{100} \times 25=18$
Number of students who are not good in mathematics $=25-18=7$

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Question 21 Mark

Convert the following ratios to percentages: $2 : 3$

Answer

$2: 3=\frac{2}{3} \times 100=\frac{200}{3}=66 \frac{2}{3} \%$

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Question 31 Mark

Convert the following ratios to percentages: $3 : 4$

Answer

$3: 4=\frac{3}{4} \times 100=\frac{300}{4}=75 \%$

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Question 41 Mark

Find the ratio of the following: $50$ paise to $₹ 5$

Answer

$\begin{aligned}
& \text { (c) } 50 \text { paise to } ₹ 5 \\
& =50 \text { paise }: 5 \times 100 \text { paise } \\
& =50 \text { paise }: 500 \text { paise } \\
& \text { ratio }=1: 10
\end{aligned}$

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Question 51 Mark

Find the ratio of the following: $5\ m$ to $10\ km$

Answer

$\begin{aligned}
& \text { (b) } 5 m \text { to } 10 km \\
& =5 m: 10 \times 1000 m[\because 1 km=1000 m] \\
& =5 m: 10000 m \\
& =1: 2000
\end{aligned}$
Hence, the ratio $=1: 2000$

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Question 61 Mark

Find the ratio of the following: speed of a cycle $15\ km$ per hour to the speed of scooter $30\ km$ per hour.

Answer

$(a)$ Speed of cycle $:$ Speed of Scooter $=15\ km$ per hour $: 30\ km$ per hour $=\frac{15}{30}=\frac{1}{2}$
Hence, the ratio $=1: 2$

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