Question

In a fish tank, 65% is female fishes. The rest are male. Female fishes are also 15 less than twice of male fishes. How many female fishes and male fishes in the tank ?

Answer 1

Answer:

There are 105 male fishes and 195 female fishes

Step-by-step explanation:

Let

x-----> the number of female fishes

y-----> the number of male fishes

we know that

65%=65/100=0.65

so

x=0.65(x+y) ----> equation A

x=2y-15 ----> equation B

substitute equation B in equation A and solve for xy

2y-15=0.65(2y-15+y)

2y-15=1.30y-9.75+0.65y

2y-15=1.95y-9.75

2y-1.95y=-9.75+15

0.05y=5.25

y=105 male fishes

Find the value of x

x=2(105)-15=195 female fishes