Question 430869
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Hi
18 less boys than girls
Let x and (x+18) represent th enumber of boys and girls respctively
Question states***
  .40(x + (x+18) = x
  .40(2x + 18) = x
       7.2 = .2x
       x = 36, the number of boys.  Number of girls is 54.  Total of 90 students

CHECKING our answer***
     .40*90 = 36