EXERCISE 4 (OBJECTIVE TYPE QUESTIONS SOLUTION IN 81 90)

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

=0.00008 x 0.0072  / 0.000048 = 8/48 x 72 / 1000 =0.012.

88.       Given exp. = 2.375 x 522 / 87 -0.0285 = 2.375 x 6 – 0.0285 = 14.25 = 0.0285 = 14.2215.

89.       Given exp. = 0.2 + 0.2 – 1 x 0.04 = 0.4. – 0.04 = 0.36.

90.   Given exp.= 11.6 + 9280/464 – 28.28/7 = 11.6 + 20 – 4.04 = 27.56.