Question

on a farm 2/7 of the cows were black and while 40 were white .find the total number of cows
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Answer 1

Answer:

2/7 are black so 5/7 are white

no. white is 40 so

5/7×total cows =40

total cows =40×7/5

total cows =56

Answer 2

Answer:

step1

here they have given that 2/7 cows are black

then

step2

we can calculate the fraction of cows which are white by doing 1-(2/7) (according to theory of fractions) as there are only two coloured cows.

step3

so we will get 5/7 th part of cows are white

step4

then let the total cows be a variable 'x' so 5/7th part of 'x' is 40

(5/7)×'x'=40 so ,x=(7/5)×40, x= 56

therefore the total no of cows are 56