S$3.35 / S$20 x 100% =
16.75% of his "S$20 million wealth" was willed to those four charities;
(13.75% x "four nephews and nieces") + (6% x "three sisters") =
73% was willed to those seven relatives of his;
so I
suspect the
market value of his "Bukit Timah house" (which
might be a
small terraced house) is 100% - 16.75% - 73% =
10.25% (or
S$2.05 million) of his "S$20 million wealth", but I
might be wrong.