81. Let 15/2 – 23 /4 /7/2 + X ÷ ½ + 5/4 /
6/5 + 7/2 = 6/10. Then, [7/4 x
2/(7 x 2X ] ÷[7/4
x 10 /47] = 3/5
= 7/2 ( 7 + 2 X) = 3/5 x 7/4 x 10/47 = 21/94
7
+ 2X = (7/2 x 94 x 21) = 47 /3
= 2 X = 47 / 3 – 7 = 26 /3
S = (26 / 3 x 1/2) = 13/3 = 4
1/3.
82. Given
exp. =3034 – (1002/2004 x 100) = 3034 – 50 = 2084.
83. Given
exp. = 5241 . 6 / 1872 + 6.28 = 2.8 + 6.28 = 9.08.
84. Let
58 / 7 of 1568 + 265.75 = X + 2455.60
X= 12992 + 265.75 = X+ 2455.60.
X = 12992 + 265.75 – 2455.60 = 13257.75 – 2455.60 = 10802.15.
85. Given
exp. = 5231.6 / 1872 + 6.28 =2.8 + 6.28 = 9.08.
86. Let
8.25 – 4.20 + 2.8 + 4/X – 2.32 .
Then ,4/X = (5.33 +4.20 + 2.32)
–(8.25 +2.8) = 11.85 -11.05 =0.80
X = 4/0.80 = 40/8= 5.
87. Given exp. = 0.008 x 0.01 x 0.0072 ÷
0.000048
