Question

What is the simplest way for a person who has only guineas to pay $10s.6d.$ to another who has only half-crowns?

Answer 1

$⟹1$ guinea $=21s.252d.$
$10s.6d.=126d$
$\because$ First person has only $1$ guineas and second person has half-crowns.
Hence, First person needs to pay that many guineas such that second person is able to return him in half-crowns.
$\therefore$ First person can give $3$ guineas and in return can take $21$ half-crowns.