21 is added to four times - Math Riddle

98.Math Riddles
If 21 is added to four times a number, the result is 57.

                
                
                

Then_the_number_is-math-riddles
  • A.9
  • B.36
  • C.7
  • D.4
A.9
    • Explanation :  
      
      4x + 21 = 57
      4x = 36
      x = 9
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