Answer: Real world problem is "A student have c toffee he distribute 
th part of those toffees to his friends. He gave total 21 toffees to his friend".
Explanation:
Let a student have c number of toffees in his bag.
It is given that he distribute th part of those toffees to his friends.
The th part of c toffees is,
The total number of distributed toffees is 21.
It is the same as given equation.
If we change the equation in words it means the th part of a number c is 21.
Let the n-th term be called
We see that if we choose
then the other numbers follow the pattern
(see :
)
Hence the sequence will be
C is the answer because a number of children are unknown.
Then your amount was reduced to $15 less
