Class X

. If 5a = 3125, then the value of 5(a - 3) is:
  1. 25
  2. 125
  3. 625
  4. 1625
(25)7.5 x (5)2.5 ÷ (125)1.5 = 5?
  1. 8.5
  2. 13
  3. 16
  4. 17.5
. If x = 3 + 22, then the value of x - 1 is: x
  1. 1
  2. 2
  3. 22
  4. . 33
If 3(x - y) = 27 and 3(x + y) = 243, then x is equal to:
  1. 0
  2. 2
  3. 4
  4. 6
The value of [(10)150 ÷ (10)146]
  1. 1000
  2. 10000
  3. 100000
  4. 106
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