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Aptitude - Ratio and Proportion - Discussion

Discussion Forum : Ratio and Proportion - General Questions (Q.No. 4)
Ratio and Proportion
4.
Seats for Mathematics, Physics and Biology in a school are in the ratio 5 : 7 : 8. There is a proposal to increase these seats by 40%, 50% and 75% respectively. What will be the ratio of increased seats?
2 : 3 : 4
6 : 7 : 8
6 : 8 : 9
None of these
Answer: Option
Explanation:

Originally, let the number of seats for Mathematics, Physics and Biology be 5x, 7x and 8x respectively.

Number of increased seats are (140% of 5x), (150% of 7x) and (175% of 8x).

140 x 5x , 150 x 7x and 175 x 8x
100 100 100

7x, 21x and 14x.
2

The required ratio = 7x : 21x : 14x
2

14x : 21x : 28x

2 : 3 : 4.

Discussion:
86 comments Page 5 of 9.
Maji ali said:   9 years ago
What is 20% of 50% of 75% of 70? Please tell me the answer.
Sikander said:   9 years ago
Isn't that simple like if we add 40% + 50% + 70% = 165,
40/165 = 2.
50/165 = 3.
75/165 = 4.
(1)
Isaactamson said:   8 years ago
The 40% of 5 =2,
50% of 7=3.5,
75% of 8 = 6,

The ratio will be 2:3:6.
Isaactamson said:   8 years ago
The 40% of 5 =2,
50% of 7 = 3.5,
75% of 8 = 6,
(5+2)x2 = 14,
(7+3.5)x2 = 21,
(8+6)x2 = 28,
= 16:21:28.

The ratio will be 2:3:4.
(2)
Priya said:   8 years ago
Very good explanation, Thanks @Harjinder Singh.
Priya said:   8 years ago
Sikander can you explain in what aspect you are taking?
Pankaj said:   8 years ago
Very good explanation, Thanks.
Sivaji said:   8 years ago
Increase % means 100+x% so 140, 150, 175values are add to 50, 70, 80 then ratio are 2:3:4.
Raju said:   8 years ago
Anyone, Please explain for me.
Zee said:   8 years ago
The required ratio = 7x : 21x/2: 14x

14x : 21x : 28x where did the 2 of 21/2 go?
2 : 3 : 4.
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