PE 1 - Ratio | Ratio, Proportion and Partnership
Two natural numbers are in the ratio 12 : 5 and the sum of their squares is 676. What are the numbers?
- A.
12 and 5
- B.
24 and 10
- C.
36 and 15
- D.
48 and 20
Answer: Option B
Explanation :
Let the numbers be 12x and 5x.
⇒ (12x)2 + (5x)2 = 676
⇒ 144x2 + 25x2 = 676
⇒ 169x2 = 676
⇒ x2 = 4
⇒ x = 2
∴ The numbers are 24 and 10.
Hence, option (b).
Workspace:
What is the third proportional to 18 and 8?
- A.
10
- B.
26
- C.
12
- D.
4
Answer: Option C
Explanation :
Let the 3rd proportion to 18 and 8 be x.
⇒
⇒ x2 = 144
⇒ x = 12
Hence, option (c).
Workspace:
Ram and Shyam invest Rs. 30,000 and Rs, 25,000 in a gym. If the gym earns Rs. 110,000 in one year, what amount does Shyam get?
- A.
Rs. 45,000
- B.
Rs. 60,000
- C.
Rs. 50,000
- D.
None of these
Answer: Option C
Explanation :
Ratio of profits of Ram and Shyam will be same as the ratio of their investments.
⇒ PR : PS = 30000 : 25000 = 6 : 5
∴ PS = 5/(6+5) × 110000 = 50,000
Hence, option (c).
Workspace:
The largest number amongst , , and is
- A.
- B.
- C.
- D.
Answer: Option D
Explanation :
The given fractions are , , and is
Of the 4 fractions 17/12 is less than 2 while rest are greater than 2. Hence, 17/12 is not the highest fraction.
Of the remaining three 26/9 is definitely greater than 23/9.
∴ One of 27/11 or 26/9 is greater.
Now, =
and, =
⇒ 26/9 i.e., is the greatest of the given fractions.
Hence, option (d).
Workspace:
Two numbers are in the ratio 5 : 6. If 8 is added to both, their ratio changes to 3 : 4. What is the value of the larger number?
- A.
12
- B.
24
- C.
10
- D.
20
Answer: Option B
Explanation :
Let the numbers be 5x and 6x respectively.
Now,
⇒ 20x + 32 = 18x + 24
⇒ 2x = 8
⇒ x = 4
∴ The larger number is 6x = 24
Hence, option (b).
Workspace:
A person distributed Rs. 1872 among Arpit, Romesh and Jitesh such that 8 times Romesh's share is equal to 12 times Jitesh's share or 3 times Arpit's share. How much does Romesh get?
- A.
Rs. 560
- B.
Rs. 495
- C.
Rs. 432
- D.
Rs. 544
Answer: Option C
Explanation :
Let their shares be A, R and J respectively.
∴ 8R = 12J = 3A
⇒ J = 2R/3 and A = 8R/3
Also, A + R + J = 1872
⇒ 8R/3 + R + 2R/3 = 1872
⇒ 13R/3 = 1872
⇒ R = 1872 × 3/13 = 432
Hence, option (c).
Workspace:
A bag can contain either 72 mangoes or 30 bananas. If the bag has 48 mangos, how many bananas can it now carry?
- A.
10
- B.
12
- C.
18
- D.
14
Answer: Option A
Explanation :
The bag already contains 48 mangoes, hence it has capacity for 24 more mangoes.
Now, 72 mangoes are equivalent to 30 bananas.
⇒ 24 mangos are equivalent to 10 bananas.
Hence, instead of 24 more mangoes, 10 bananas can be carried in the bag.
Hence, option (a).
Workspace:
If a : b = 5 : 4 and b : c = 6 : 11, what is the value of (2a + 2c) : (2b - a)?
- A.
37 : 4
- B.
74 : 9
- C.
46 : 25
- D.
32 : 19
Answer: Option B
Explanation :
Given, a : b = 5 : 4 and b : c = 6 : 11
∴ a : b : c = 5 × 3 : 12 : 11 × 2 = 15 : 12 : 22
⇒ = =
Hence, option (b).
Workspace:
Akanksha started a business with 24,000. Swapnil joined him two months later with an investment of Rs. 16,000. In what ratio would they share the annual profit?
- A.
6 : 5
- B.
5 : 6
- C.
9 : 5
- D.
5 : 9
Answer: Option C
Explanation :
= = =
Hence, option (c).
Workspace:
If (a + b) : (b + c) : (c + a) = 3 : 4 : 5 and (a + b + c) = 18, what is the value of a?
- A.
3
- B.
9
- C.
8
- D.
6
Answer: Option D
Explanation :
Let a + b = 3x …(1)
b + c = 4x and …(2)
c + a = 5x …(3)
Adding all three equations, we get
⇒ 2(a + b + c) = 12x
⇒ a + b + c = 6x …(4)
(4) and (1) ⇒ c = 3x
(4) and (2) ⇒ a = 2x
(4) and (3) ⇒ b = x
Now, we also know a + b + c = 18
⇒ 2x + x + 3x = 18
⇒ x = 3
∴ a = 2x = 6
Hence, option (d).
Workspace:
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