Question

Please answer.........

These are Multiple Choice questions​

Answer 1

Answer :

1. The ratio of 3m and 60 cm is

• 4 : 1
• 3 : 1
• 5 : 1 ✓
• 2 : 1

Step-by-step explanation :

Converting 3m to cm ( 3m → 300m )

Therefore, Ratio,

➙ 300 : 60

➙ 5 : 1

2. The ages of father and son are 45 years and 10 years. The ratio of their ages are

• 3 : 2
• 5 : 2
• 9 : 2 ✓
• 15 : 2

Step-by-step explanation :

Ratio of their ages are,

➙ 45 : 10

➙ 9 : 2

3. The cost of 3 envelopes is Rs. 15. Find the cost of 5 envelopes.

• Rs. 20
• Rs. 25 ✓
• Rs. 30
• Rs. 40

Step-by-step explanation :

Given, 3 envelopes = Rs. 15 Therefore,

➙ 1 envelope = 15 / 3

➙ 1 envelope = Rs. 5

Therefore, 5 envelopes cost,

➙ 5 × 5

➙ Rs. 25

4. 1/4 as per cent is

• 20%
• 25% ✓
• 30%
• 12%

Step-by-step explanation :

Percentage of 1/2 is

➙ 1/4 × 100

➙ 25%

5. 0.04 as per cent is

• 10%
• 20%
• 25%
• 4% ✓

Step-by-step explanation :

Percentage of 0.04 is

➙ 0.04 × 100

➙ 4%

6. If 3/4 = ?/12, Then, ? =

• 3
• 6
• 9 ✓
• 12

Step-by-step explanation :

Let us assume ? as x,

➙ 3/4 = x/12

➙ 4 × x = 12 × 3

➙ 4x = 36

➙ x = 36 / 4

➙ x = 9

7. Which of the following is a negative rational number

• 1/2
• 3/4
• -4/-5
• 2/-3 ✓

8. The rational number 12/40 in standard form is

• 3/10 ✓
• 6/10
• 3/20
• 6/20

Step-by-step explanation :

The standard form of 12/40 is

➙ 12/40

➙ 6/20

➙ 3/10

9. Which of the following rational numbers is not equivalent to 7/-4 ?

• 14/-8
• 21/-12
• 28/-16
• 7/-8 ✓

10. The reciprocal of -2/5 is

• -5/2
• 5/2
• 2/5 ✓
• -2/5

Answer 2

1. we know 1 metre = 100 cm

so 3m = 3×100 = 300 cm

= 300 : 60

= 5:1

Option C

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2. Given

Father age = 45

Son's age = 10

= 45 : 10

= 9 : 2

Option C

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3. Given

cost of 3 envelopes = 15 /-

cost of 1 envelope = $\large\mathsf{\frac{15}{3} \: = \: 5}$

cost of 5 envelopes = 5×5 = 25/-

Option B

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4. $\mathsf{\frac{1}{4} \times 100}$

= 25 %

Option B

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5. $\mathsf{0.04 \times 100 \: = \: 4 \%}$

Option D

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6.

$\bf \frac{3}{4} = \frac{x}{12} \\ \\ \bf \: x = \frac{3 \times 12}{4} \\ \\ \bf \: x = 3 \times 3 = 9$

Option C

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7.

$\bf \: (opition \: d) \: \frac{2}{ - 3}$

______________________________________

8.

$\bf \: \frac{12}{40} = \frac{6}{20} = \frac{3}{10}$

Option A

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9.

Option D is the correct answer

______________________________________

10.

$\bf \: \: reciprocal \: of \: \: \frac{ - 2}{5} \: \: is \: \bf\frac{1} {\frac{ - 2}{5} } \\ = \bf \frac{ - 5}{ 2}$

Option A

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