Question

2/3 of dogs are white .4/7 of them have black spots on then rest of them are black .Find the ratio of dogs with black spots to that of black dogs​

Answer 1

white dogs=2/3

white dogs with black spots

=4/7of2/3=8/21

black dogs=1-2/3

=1/3

1/3=1x7/3x7=7/21

ratio of dogs with black spots to that of black dogs

=8:7

Answer 2

The required ratio is 8:7.

Step-by-step explanation:

Since we have given that

Fractions of dog are white = $\dfrac{2}{3}$

Fraction  of them have black spots = $\dfrac{4}{7}\times \dfrac{2}{3}=\dfrac{8}{21}$

Rest of them are black = $1-\dfrac{2}{3}=\dfrac{3-2}{3}=\dfrac{1}{3}$

So, the ratio of dogs with black spots to that of black dogs are given by

Dogs with black spots : Black dogs

$\dfrac{8}{21}:\dfrac{1}{3}\\\\=8:\dfrac{21}{3}\\\\=8:7$

Hence, the required ratio is 8:7.

# learn more:

At the dog park, 2 dogs are black with spots, 5 dogs are white with spots, 1 dog is solid white, and 4 dogs are solid black. What is the probability of a dog being black or with spots?

https://brainly.in/question/8651157