JAMB 1986 · UME · Q10

A number of pencils were shared among Bisi, Sola and Tunde in the ratio $2 : 3 : 5$ . If Bisi got 5, how many were shared out?

Worked solution (try it first)

The ratio $2 : 3 : 5$ has $2 + 3 + 5 = 10$ parts, and Bisi's 5 pencils are 2 parts.
So one part is $5 \div 2 = 2.5$ pencils.
All 10 parts are $10 \times 2.5 = 25$ pencils, option B.