71. Let
4335 / X ÷
15/8 = 289 / 528 . then,
4335 / X = 289 / 528 x 15 / 8
4335 /X = 289 x 5 / 176 x 8
X = ( 4335 x 176 x 8/289 x 5 =
4224.
Missing digit =2.
72. Let
16/3 – 11/3 ÷
4/3 ÷
X + 16 /5 ÷
6/5 = 7. Then,
16/3 – 11/3 x ¾ x 1/X + 16/5 x 5/6 = 7
16/3 – 11/4X + 8/3 =7
24/3 -11/4X =7
11/4X = 8-7 =1
4 X = 11
X = 11/4 = 2 ¾
73. Given
exp. = 9 – 11/9 of 36 / 11÷36 /7 of 7/9 = 9-1 =8.
74. Let
5/6 ÷
6/7 x X -8/9 ÷ 8/5 + ¾ x 10/3 = 25/9. Then,
5/6 x 7/6 x X – 8/9 x 5/8 + ¾ x
10/3 = 25/9
