Birthday party

For her youngest son's birthday party, mother bought 6 3/4 kg of hotdog and 5 1/3 dozens bread rolls. Hotdogs cost 160 per kilogram and a dozen bread roll costs 25. How much did she spend in all?

Correct result:

x =  1213.3333

Solution:

$x=(6+3\mathrm{/}4)\cdot 160+(5+1\mathrm{/}3)\cdot 25={\displaystyle \frac{3640}{3}}=1213.3333$

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