SOLUTION: the ratio of the number of guppies to black mollies in an aquarium was 3:5 .when a number of guppies died,the ratio of the number of guppies to black mollies became 3:8.if there

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: the ratio of the number of guppies to black mollies in an aquarium was 3:5 .when a number of guppies died,the ratio of the number of guppies to black mollies became 3:8.if there       Log On


   



Question 587657: the ratio of the number of guppies to black mollies in an aquarium was 3:5 .when a
number of guppies died,the ratio of the number of guppies to black mollies became 3:8.if there were 144 guppies at first how many guppies died

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = number of black mollies at start
given:
+144%2Fx+=+3%2F5+
+144%2A5+=+3x+
+x+=+720%2F3+
+x+=+240+
The number of the black mollies did not change.
let +y+ = number of guppies after some had died
+y+%2F+240+=+3%2F8+
+8y+=+3%2A240+
+8y+=+720+
+y+=+720%2F8+
+y+=+90+
+144+-+90+=+54+
54 guppies died