Class VII

If seven times a number is 15 less than twelve times the same number, then the number is
  1. 2
  2. 3
  3. 4
  4. 5
The solution of the equation ax - b = 0 is
  1. -b/a
  2. b/a
  3. -a/b
  4. a/b
If x + 7 = 10, then the value of 5x - 10 is
  1. 3
  2. -3
  3. 5
  4. -5
What is y in 10y – 20 = 50?
  1. 5
  2. 9
  3. 7
  4. 2
Solve: 3s + 12 = 0
  1. None of these
  2. s = 4
  3. s = -4
  4. s = 5
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