Reasonin Rakesh Yadav

www.yoursmahboob.wordpress.com
In 2016 the population would
be (2016 esa] tula[;k gksxh ) = 12483
× 2 = 24966
In 2023, the population would
be (2023 esa] tula[;k gksxh) = 24966
× 2 = 49932
In 2030, the population would
be (2030 esa] tula[;k gksxh)
= 49932 × 2 = 99864
Therefore, increase in
population by 2030 (vr% 2030
rd tula[;k es a o`f¼)
= 99864 – 12483 = 87381
Increase in population by 2023
(2023 rd tula[;k es a o`f¼)
= 49932 – 12483 = 37449
Thus, the required year would
be after 2023 and before 2030.
(bl izdkj 2023 ds ckn vkSj 2030 ds
igys rd vkcknh vko';d o"kZ gksxhA)
30. (c) Suppose his present age is
x years.
ekuk mldh orZeku vk;q x gSA
According to question,
iz'ukuqlkj]
x x x
x
4 5 3
–13
15x 12x 20x
x –13
60
47x = 60x – 780
60x – 47x = 780
13x = 780
780
x 60 years
13
31. (c) Suppose total number of
workers in the officer
(ekuk dk;kZy; esa dqy dfeZ;ksa dh la[;k)
= x
Number of woman workers
(efgyk dfeZ;ksa dh la[;k) = 3
x
Number of man workers
(iq:"k dfeZ;ksa dh la[;k)
x 3x – x 2x
x –
3 3 3
Number of married woman
workers ('kknh'kqnk efgyk dfeZ;ksa dh
la[;k ) =
x 1 x
3 2 6
Number of married woman
workers and have children.
('kknh'kqnk efgyk dfeZ;ksa vkSj muds cPpksa
dh la[;k) =
x 1 x
6 3 18
Number of married man
workers ('kknh'kqnk iq:"k dfeZ;ksa dh
la[;k) = 2 x 3 x =
3 4 2
Number of married man
workers who have children
('kknh'kqnk iq:"k dfeZ;ksa vkSj muds cPpksa
dh la[;k)
x 2 x
2 3 3
Number of workers who have
children (dfeZ;ksa dh la[;k ftuds ikl
x x
cPpsa gSA) = 3 18
= 6x x 7x
18 18
Number of workers without
children (fcuk cPpksa okys dfeZ;ksa dh
la[;k)
=
32. (c)
7 18 – 7 11
x – x
x x x
8 18 18
TV
20
55
Car
15
Percent of those surveyed who
did not own either a car or a
TV (tux.kuk dk og izfr'kr ftuds ikl
u rks dkj vkSj u gh Vh-oh gS)
= 100 – (20 + 55 + 15)
Rakesh Yadav Sir
= 100 – 90 = 10%
33. (b) 34.25 + 2.50 = 36.75
36.75 + 3.00 = 39.75
39.75 + 3.50 = 43.25
43.25 + 4.00 = 47.25
47.25 + 4.50 = 51.75
51.75 + 5.00 = 56.75
34. (a) Suppose the present age of
the mother (ekuk mlds ekrk dh orZeku
vk;q ) = x years
Present age of person (O;fDr dh
2
orZeku vk;q ) 5 x years
8 years hence (8 o"kZ ckn)
2 x
8
x 8
5 2
or,
2x
40
2 x 8
5
or, 4x + 80 = 5x + 40
or, 5x – 4x = 80 – 40
x = 40 years
35. (d) Suppose the present age of
younger daughter is x years.
(ekuk mldh NksVh iq=kh dh orZeku vk;q x o"kZ gSA)
Present age of the elder
daughter (cM+h iq=kh dh orZeku vk;q ) =
x + 5 years.
Present age of the father (firk
dh orZeku vk;q) = 3 (x + 5) years.
According to the question,
iz'ukuqlkj]
8 (x – 5) = 3x + 15 – 5
or, 8x – 40 = 3x + 10
or, 8x – 3x = 10 + 40
50
x 10 years
5
Present age of father (firk dh
orZeku vk;q)
= 3 × 10 + 15 = 45 years
36. (d) Suppose the present age of
Leela is x years
ekuk yhyk dh orZeku vk;q x gSA
Therefore, the present age
Neela (vr%] uhyk dh orZeku vk;q) =
3x years
10 years ago (10 o"kZ igys)
5 (x – 10) = (3x – 10)
5x – 50 = 3x – 10
5x – 3x = 50 – 10
2x = 40
x = 40 20
2 years
37. (b) Suppose the present age of
Antony is x years and 20 years
ago his age was 2
x
years.
ekuk ,aVksuh dh orZeku vk;q x o"kZ gSA vkSj
20 o"kZ igys mldh vk;q Fkh 2
x o"kZ
434 Rakesh Yadav Readers Publication Pvt. Ltd