Li Zhen, Kara and Rose were typing. Li Zhen typed 2 times as fast as Kara. The ratio
of the number of words Kara typed to the number of words Rose typed was 4 : 1.
a) What was the ratio of the number of words Li Zhen typed to the number of words Kara typed to the number of words Rose typed?
Kara typed 48 words.
b) How many words did Li Zhen, Kara and Rose type altogether?
