141. Original
number of sections = (16 – 3) =13.
Original number of students =( 24 x 16 ) =312
Present number of students = (21 x 16) = 336.
Number of new students admitted
= (336 – 312) = 24.
142. Time
between 10 a.m. and 13. 27 hours = 3 hrs. 27 min. = 207 min.
For three periods in between free time = 15 min.
Remaining time = (207 – 15) min. = 192
min.
Duration of each of the 4 periods = (192 / 4
) min. = 48 min.
143. Hrs. Min. sec
3 17 49
(-)
1 54 50
1 22 59
Total time = (1 x 60 + 22) min. +
59 sec. = (82 x 60 + 59) sec. = 4979 sec.
Number of times
the light is seen = (4979 / 13 + 1) = 384.
144. Money
earned in 2 days = Rs. (20 – 15) = Rs. 5.
Money earned in 16 days =
Rs. (5/2 x 16) = Rs. 40.
On 17th day,
money in hand = Rs. [1000 x x + (z – 1000) x y] = Rs. (1000x + z y – 1000y)
= Rs. [1000 ( x- y + y z].
145. Required
cost = Rs. [1000 x X + (z – 1000 ) x y] = Rs. (1000 X + z y – 1000 y)
= Rs. [1000 ( x – y ) + y
z).
146. 26
trees have 25 gaps between them. Hence, required distance = (225 /25) m = 9,
147. Let the number be x. then, 52 X – 25 X – 25 X =
324 27 X = 324 X 12.
148. Among
the given numbers, only 60489 is a multiple of 423.
149. Let
the monthly salary of a woman = Rs. X.
Then, monthly
salary of a woman = Rs. ( X + 500).
4x +2 ( X +
500 ) = 46000 6X = 45000 X = 7500.
Monthly salary
of a woman = X + 500 = Rs. 8000.
150. Let
marks in history = X. then, marks in English = 5/2 x.
Then,
X + 5/2 X = 140 7/2X = 140 X =
(140 x 2 / 7) = 40.
Hence,
marks in English = 5/2 x 40 ) = 100.
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