If a/3 = b/4 = c/7, then (a + b + c) / c is equal to:

मान लीजिए a/3 = b/4 = c/7 = k। तो a=3k, b=4k, c=7k। (3k + 4k + 7k) / 7k = 14k / 7k = 2।