Question

The digit 6 is placed in front of a 3-digit number abc, to form a 4-digit number. the sum of the 4-digit number and 300 is 8 times the original 3-digit number, find the abc

Answer 1

Explanation:

abc = x

6 in front of abc means it is abc + 6000.

x + 6000 + 300 = 8x

x + 6300 = 8x

6300 = 7x

x = abc = 900