A fish tank contains 1/2 as many goldfish as mollies, and there are 6 more guppies than goldfish. If the total combined number of fish in the tank is 22, how many mollies are in the tank?

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2016-04-11 16:59:53

gf=m/2, gu=gf+6, so gu=m/2+6 gf+gu+m=22, using gf and gu from above we have: m/2+m/2+6+m=22 combine like terms on the left side 2m+6=22 subtract 6 from both sides 2m=16 divide both sides by 2 m=8 So there are 8 mollies in the tank.

2016-04-11 17:01:08

m=molliesg=goldfish = 0.5mp=guppies = g+6 = 0.5m +622=m+0.5m+0.5m +622=2m+616 =2mm = 8 molliescheck1/2 *8 = 4 goldfish4+6 =10 guppies8 mollies10 + 8 + 4= 22 so there were 8 mollies

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