AIMO 2015 Q3

Algebra Level 4

A selection of 3 whatsits, 7 doovers and 1 thingy cost a total of $329. A selection of 4 whatsits, 10 doovers and 1 thingy cost $441. What is the total cost, in dollars, of 1 whatsit, 1 doover and 1 thingy?

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