Joanna bought 50 goldfish. 60% of them were females.When some female goldfish died, the percentage of the?

Question

female goldfish became 20%.
a) How many male goldfish were there ?
b) How many female goldfish died ?

Answer 1

if 60% were female, %40 were male.
50 * .4 = 20

since none of the males died, you need to figure out how many females you would need to make up 20% of the total population, which is a number higher than 20 but less than 50. if you use the guess and check method, you find that 5 females divided by 25 total fish = 20.833%.
5 / 25 = .2083

we already know that there were 20 males of the 50, so 30 must be female.
30 - 5 = 25

so...
a.) 20
b.) 25

Answer 2

x = original # of females
y = number of females that died
x/50 = 60/100
x = 30
50 - 30 = 20 male goldfish
(30 - y)/(50 - y) = 0.2
30 - y = 10 - 0.2y
0.8y = 20
y = 20/0.8 = 25 females died

Answer 3

a) 20 males (and originally 30 females)
b) 25 females died (leaving 25 total fish, five of which are female

Answer 4

a) 20 male goldfish
b)10 female goldfish died

Answer 5

20 male, 20 female died

Answer 6

suppose X female fish died, solve the equation
(50*60%-x)/(50-x) = 20%

x= 25

a) male fish: 50* (1-60%)=20
b) 25

Answer 7

LOL! 4 people, 4 different answers. You should ask this quesiton again in different category, like General Math and Science or Homework Help

Answer 8

a) (50)(.6)=30, so 50-30= 20 males

b) (50)(.6)= 30, (30)(.2)= 6 alive, therefore 24 died