type 3 addition subtraction product on ratio & proportion Section-Wise Topic Notes With Detailed Explanation And Example Questions
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The following question based on ratio & proportion topic of quantitative aptitude
(a) 39
(b) 52
(c) 27
(d) 20
The correct answers to the above question in:
Answer: (a)
Let the numbers be 3x, 4x and 5x.
5x + 3x = 4x + 52
4x = 52 ⇒ x =13
The smallest number
= 3x = 3 × 13 = 39
Discuss Form
Read more addition subtraction product on ratio and proportion Based Quantitative Aptitude Questions and Answers
Question : 1
If the square of the sum of two numbers is equal to 4 times of their product, then the ratio of these numbers is :
a) 1 : 1
b) 1 : 2
c) 1 : 3
d) 2 : 1
Answer »Answer: (a)
$(x + y)^2 = 4xy$
$x^2 + y^2 + 2xy - 4xy = 0$
$(x - y)^2$ = 0 ⇒ x = y
x : y = 1 : 1
Question : 2
The sum of three numbers is 116. The ratio of second to the third is 9 : 16 and the first to the third is 1 : 4. The second number is
a) 34
b) 36
c) 32
d) 30
Answer »Answer: (b)
Number | II | III | I | ||
9 | : | 16 | |||
4 | : | 1 | |||
36 | : | 64 | : | 16 | |
9 | : | 16 | : | 4 |
Therefore, second number
=$9/{9 +16+4}×116$
=$9/29×116=36$
Question : 3
The ratio of two numbers is 10 : 7 and their difference is 105. The sum of these numbers is
a) 1190
b) 1610
c) 805
d) 595
Answer »Answer: (d)
Let the nos. be 10x & 7 x then,
10 x - 7x = 105
3x = 105 ⇒ x = 35
Sum = 10x + 7x = 17x
= 17 × 35 = 595
Question : 4
Two numbers are in the ratio 1 : 3. If their sum is 240, then their difference is
a) 100
b) 96
c) 108
d) 120
Answer »Answer: (d)
Let the numbers be 3x and x,
Then, 3x + x = 240
4x = 240
$x = 240/4$ = 60
Difference = 3x - x = 2x
= 2 × 60 = 120
Question : 5
If A and B are in the ratio 4 : 5 and the difference of their squares is 81, what is the value of A ?
a) 36
b) 15
c) 12
d) 45
Answer »Answer: (c)
Let A = 4x and B = 5x.
According to the question,
$(5x)^2 - (4x)^2$ = 81
$25x^2 - 16x^2$ = 81
$9x^2 = 81 ⇒ x^2$ = 9
$x = √9$ = 3
A = 4x = 4 × 3 = 12
Question : 6
Which number when added to each of the numbers 6, 7, 15, 17 will make the resulting numbers proportional ?
a) 4
b) 3
c) 5
d) 6
Answer »Answer: (b)
Let required number be x.
${6 +x}/{7 + x} = {15 + x}/{17 + x}$
$102 + 17x + 6x + x^2$
= $105 + 7x + 15x + x^2$
23x - 22x = 105 - 102
x = 3
Note : It is convenient to solve it orally using options
${6 + 3}/{7 + 3} = {15 + 3}/{17 + 3}$
= $9/10 = 18/20$
Using Rule 32Let 'x' be a number which is subtracted from a, b, c and d to make them proportional, thenx = ${ad - bc}/{(a+d) - (b+c)}$Let 'x' be a number which is added to a, b, c and d to make them proportional, thenx = ${bc - ad}/{(a+d) - (b+c)}$Here, a, b, c and d should always be in ascending order.
Required Number
= ${bc - ad}/{(a+d) - (b+c)}$
Where a = 6, b = 7, c = 15, d = 17
= ${7 × 15 - 6 × 17}/{(6 + 17) - (7 + 15)}$
= ${105 - 102}/{23 - 22}$ = 3
GET ratio & proportion PRACTICE TEST EXERCISES
type 1 basic concepts of ratio & proportion
type 2 age based ratio & proportion problems
type 3 addition subtraction product on ratio & proportion
type 4 income & expenditure based ratio & proportion problems
type 5 shares & partnership based ratio & proportion problems
type 6 fractions based ratio & proportion problems
type 7 finding sum difference product based ratio & proportion problems
type 8 alligation & mixtures based ratio & proportion problems
type 9 coins & rupees based ratio & proportion problems
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