SOLUTION: In a class of 42 students, the number of boys is 2/5 of the girls. Find the number of boys and girls in the class.

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: In a class of 42 students, the number of boys is 2/5 of the girls. Find the number of boys and girls in the class.       Log On


   

Question 864705: In a class of 42 students, the number of boys is 2/5 of the girls. Find the number of boys and girls in the class.

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi

 x+%2B+%282%2F5%29x+=+42     |Multiplying thru by 5 so as all denominators = 1

 5x + 2x = 210

    7x = 210

     x = 30, girls and 12 boys %282%2F5%2930

and...checking!

 30 + 12 = 42