221. Let
number of boys = X. then, number of girls = (60 – X).
X (60 –X ) +
(60 –X ) X = 1600 60X - X² +
60X - X²
= 1600
2X² -
120X + 1600 = 0 X² -
60X + 800 = 0.
(X – 40) ( X – 20)
= 0 x = 40 or X = 20.
So, we are not
definite. Hence, data is inadequate.
222. Let
the distance covered by taxi be X k. then, distance covered by car = (80 – X)
km.
1.5X + 0.5
(80 –X ) = 50 X = 50 – 40 = 10km.
223. Let
the distance covered by taxi be X. number of incorrect answers = (60 –X)
4X =
(60 – X)= 130 5X = 190 X = 38.
224. Let
number of matches lost = X. then, number of matches won = X + 3.
2 – (X + 3 )
– X = 23 X = 17.
Hence, total
number of matches played =X + 9x + 3) =2X = 3= 37.
225. Let
the number of 20-paise coins be X. then, number of 25 –paise coins =(324 –X).
0.20 x X +
0.25 ( 324 – X) = 71 20X + 25 (324 – X)
= 7100
5 X =
1000 X = 200.
