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If two numbers are divisible by a number,
their sum is also divisible by the number
16 & 20 is divisible by 4
Sum = 16 + 20 = 36
∴ 36 is also divisible by 4
36 & 78 are divisible by 6
Sum = 36 + 78 = 114
∴ 114 is also divisible by 6
100 & 25 are divisible by 5
Sum = 100 + 25 = 125
∴ 125 is also divisible by 5
