the numbers a, b, care the digits of a three digit number which satisfy 49a + 7b + c = 286. then the value of 100a + 10B + c =?

In this question the three digit number is 556 where a = 5b = 5 c = 6 This is a unique solution and the answer to the equation 100a+10b+c is 556 which is the number itself