Arithmatical - Decimal Fraction

DIRECTIONS : Problems based on Decimal Fraction.
6. A tailor has 37.5 metres of cloth and he has to make 8 pieces out of a metre of cloth. How many pieces can be make out of this cloth?
  A.  300
  B.  360
  C.  400
  D.  None of these
Solution
Length of each pieces= (1 / 8) m
= 0.125 m
Required number of pieces(37.5/0.125) = (375×100 / 125)
= 300.
7. How many digits will be there to the right of the decimal point in the product of 95.75 and .02554?
  A.  5
  B.  6
  C.  7
  D.  8
Solution
Som of decimal places= 7.
Since the last digit to the extreme right will be zero ( ∴ 5 x 4 = 20), so there will be 6 significant digits to the right of the decimal point.

8. 12.1212+17.0005 - 9.1102 = ?
  A.  20.0015
  B.  20.0105
  C.  20.0115
  D.  20.1015
Solution
Given expression
=(12.1212+17.0005)-9.1102
= (29.1217 - 9.1102)
=20.0115.
9. 4.036 divided by 0.04 gives
  A.  1.009
  B.  100.09
  C.  10.9
  D.  None of these
Solution
4.036 / 0.04= 403.6 / 4
= 100.9
10. If 2994 ÷14.5 = 172, then 29.94 ÷ 1.45 = ?
  A.  172
  B.  0.172
  C.  1.72
  D.  17.2
Solution
(29.94/1.45)= 299.4/14.5
= (2994/14.5×1/10)
= 172/10
= 17.2.
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