“A father aged 60, and his son aged 30, who hav successiv “life interests in a landed estate, jointly borrow the sum ov £10,000 “from an insurance company, at 5 per-cent interest, upon mortgage “ov their life interests and a policy for £11,000, upon the life ov “the son, effected at the annual premium ov £2. 3s. per-cent. a “private arrangement being made between the borrowers, by which “the father is to pay the interest and premium during his life, and “the son is to pay them subsequently. In what proportion shoud “the £10,000 be divided between the father and the son?”