Question

on a farm 3/7 of the cows were black while 28 were white.
a- find the total number of cows
b- find the number of black cows

Answer 1

thus 4/7is 28 so1/7 is 28÷4 which is 7 and thus 3/7 is 3×7= 21cowsof black and total 49 cows

Answer 2

let the total cows be x

white cows = 28

black cows = 3/7 x

total cows = 3x/7 + 28

x = 3x/7 + 28

x - 3x/7 = 28

4x/7 = 28

x = 49

a) total cows = 49

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b) black cows = 3 x 49/7 = 21