Question

sanhita prepared a cake ,of which 3/4 was eaten by her brother, 1/7th by her sister and rest by herself.what part of the cake did she have

Answer 1

let the cake be the whole number 1
3/4 + 1/7 = 25/28
then subtract 1/1 and 25/28
you get 3/28
this is your answer I feel
hope it helps ypu

Answer 2

let the whole part of the cake be x
So according to the question
x-3x/4-1x/7
x-25x/28
3x/28
So 3/28th part of the cake was eaten by her