37(8) = 3 * 8^1 + 7 * 8^0 = 31(10);
66(8) = 6 * 8^1 + 6 * 8^0 = 54(10);
70(8) = 7 * 8^1 + 0 * 8^0 = 56(10);
215(8) = 2 * 8^2 + 1 * 8^1 + 5 * 8^0 = 141(10);
31(10) + 54(10) + 56(10) = 141(10)
37(8) = 3 * 8^1 + 7 * 8^0 = 31(10);
66(8) = 6 * 8^1 + 6 * 8^0 = 54(10);
70(8) = 7 * 8^1 + 0 * 8^0 = 56(10);
215(8) = 2 * 8^2 + 1 * 8^1 + 5 * 8^0 = 141(10);
31(10) + 54(10) + 56(10) = 141(10)