Example GIF

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 
    • Explanation :  

4x + 21 = 57
4x = 36
x = 9