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$60.16
After rounding it works out at 47 cent.
2a + b = 47; a + 3b = 81 ie a = 81 - 3b so - 162 - 6b + b = 47 ie 5b = 115 so b = 23 and a = 12
It depends on what you want to compare or convert the 47 metres to? More information is needed.
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