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Question (11)

QN0019862

If a : b : c :: 4 : 6 : 8 and a = 12, then b =

(A) 16
(B) 18
(C) 20
(D) 24

Correct Answer: B

Explanation:

Scale factor = 3, so b = 6×3 = 18.

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Question (12)

QN0019863

A mixture contains rice : wheat : pulses = 3 : 5 : 2. If rice is 15 kg, wheat is:

(A) 20 kg
(B) 25 kg
(C) 30 kg
(D) 35 kg

Correct Answer: B

Explanation:

Scale factor = 5, so wheat = 5×5 = 25 kg.

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Question (13)

QN0019864

If 2 : 5 : 7 :: 4 : 10 : x, then x =

(A) 12
(B) 13
(C) 14
(D) 15

Correct Answer: C

Explanation:

The ratio is doubled, so x = 14.

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Question (14)

QN0019865

The ratio 8 : 12 : 16 in simplest form is:

(A) 2 : 3 : 4
(B) 4 : 6 : 8
(C) 1 : 2 : 3
(D) 3 : 4 : 5

Correct Answer: A

Explanation:

Divide all terms by 4.

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Question (15)

QN0019866

If 5 : 10 : 15 is multiplied by 2, the new ratio becomes:

(A) 5 : 10 : 15
(B) 10 : 20 : 30
(C) 15 : 20 : 25
(D) 20 : 30 : 40

Correct Answer: B

Explanation:

Multiply each term by 2.

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Question (16)

QN0019867

In the ratio 3 : 4 : 5, if the first quantity is 21, the third quantity is:

(A) 28
(B) 30
(C) 35
(D) 42

Correct Answer: C

Explanation:

Scale factor = 7, so third quantity = 5×7 = 35.

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Question (17)

QN0019868

A classroom has boys : girls : teachers = 12 : 15 : 3. If teachers are 6, girls are:

(A) 24
(B) 28
(C) 30
(D) 36

Correct Answer: C

Explanation:

Scale factor = 2, so girls = 15×2 = 30.

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Question (18)

QN0019869

If 7 : 14 : 21 :: 1 : 2 : x, then x =

(A) 2
(B) 3
(C) 4
(D) 5

Correct Answer: B

Explanation:

Simplifying gives 1 : 2 : 3.

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Question (19)

QN0019870

A spice mix contains ingredients in the ratio 4 : 2 : 1 : 0.5. If the second ingredient is 8 spoons, the first ingredient is:

(A) 12 spoons
(B) 14 spoons
(C) 16 spoons
(D) 18 spoons

Correct Answer: C

Explanation:

Scale factor = 4, so first ingredient = 4×4 = 16 spoons.

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Question (20)

QN0019871

Which equality is true when a : b : c :: p : q : r?

(A) a + b = p + q
(B) a/p = b/q = c/r
(C) a − b = p − q
(D) a × b = p × q

Correct Answer: B

Explanation:

Corresponding terms have equal ratios.

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Question (11)

If a : b : c :: 4 : 6 : 8 and a = 12, then b =

Explanation:

Link:

Question (12)

A mixture contains rice : wheat : pulses = 3 : 5 : 2. If rice is 15 kg, wheat is:

Explanation:

Link:

Question (13)

If 2 : 5 : 7 :: 4 : 10 : x, then x =

Explanation:

Link:

Question (14)

The ratio 8 : 12 : 16 in simplest form is:

Explanation:

Link:

Question (15)

If 5 : 10 : 15 is multiplied by 2, the new ratio becomes:

Explanation:

Link:

Question (16)

In the ratio 3 : 4 : 5, if the first quantity is 21, the third quantity is:

Explanation:

Link:

Question (17)

A classroom has boys : girls : teachers = 12 : 15 : 3. If teachers are 6, girls are:

Explanation:

Link:

Question (18)

If 7 : 14 : 21 :: 1 : 2 : x, then x =

Explanation:

Link:

Question (19)

A spice mix contains ingredients in the ratio 4 : 2 : 1 : 0.5. If the second ingredient is 8 spoons, the first ingredient is:

Explanation:

Link:

Question (20)

Which equality is true when a : b : c :: p : q : r?

Explanation:

Link:

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