F.4 Maths---variation

以下兩題Past Paper數點樣計??


1. The ratio of the marbles owned by Susan to the number of marbles owned
by Terease is 5:2. Susan has n marbles. If Susan gives 18 of own marbles to
Teresa, both of them will have the same number of marbles. Find n.



2. The ratio ot the volumes of two similar solid circular is 8:27
a) Find the ratio of the height of the smaller cone to the height of the larger