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There were an equal number of Mercedes cars and Volkswagen cars in a car showroom on the 1st of October.
By the 31st of October, 21 Mercedes cars and 86 Volkswagen cars had been sold.
The ratio of the remaining Mercedes cars to Volkswagen cars became 6 : 1.
(a) How many Mercedes cars were left in the showroom?
(b) How many Volkswagen cars were there in the showroom at first?
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