Answer :
It is given that on dividing 70 by the required number, there is a remainder 5. This means that 70 − 5 = 65 is exactly divisible by the required number. Similarly, 125 − 8 = 117 is also exactly divisible by the required number.
65 =5 × 13
117 = 32 × 13
⇒ Required number = 13 HCF = 13
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