Posted by Amponsah on Monday, April 9, 2012 at 4:42am.
original number of balls --- x
original number of red balls = x/4
number of red balls added = 5
total balls added = 45
new total = x+45
new red ball total = (x/4 + 5)
(1/5)(x + 45) = x/4 + 5
x/5 + 9 = x/4 + 5
times 20
4x + 180 = 5x + 100
x = 80
you had 80 balls
check:
you had 80 of which 20 were red
you added 45 of which 5 were red
new total 125
new number of red = 25
is 25 equal to 1/5 of 125 ? YES!!
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