The greatest number that divides 62, 132 and 237 leaving the same remainder in each case is used as the divisor. That common remainder is:

The divisor must divide all the differences: 132 − 62 = 70, 237 − 132 = 105 and 237 − 62 = 175. HCF(70, 105, 175) = 35, so the divisor is 35. Now 62 = 35 + 27, 132 = 105 + 27 and 237 = 210 + 27, so the common remainder is 27. Answering 35 gives the divisor instead of the remainder.