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.
