Question

on our street there are twice as many cats as dogs .If there are 21 cats and dogs altogether.haw many dogs are there?
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Answer 1

Answer:

No.of dogs=7

Step-by-step explanation:

let's take no. of cats as Nc and no.of dogs as Nd.

given, 2Nd= NC

and NC+Nd= 21

we can write NC. as 2Nd

therefore, 2Nd+Nd=21

3Nd=21

Nd=21/3=7

so, no.of dogs = 7

since cats are twice as many of dogs,

no.of cats= 2(7)= 14