Question

On a farm, 2/7 of the cows were black, while 40 were white. Find the total number of cows

Answer 1

Step-by-step explanation:

let the total number of cows = A

then, black cows are 2/7*A= 2A/7

remaining cows are A -2A/7=5A/7

5A/7= 40,A = 40*7/5= 56