exam Maths Puzzle Numerical Ability

Find the area of triangle ABC if A=56 degrees, b=20 ft, and c=12 feet. Round to the nearest tenth.

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Please help me solve this problem: what is the square root of n+9 (under square root sign) +3=n (not under the square root sign

Thank you Soybean meal is 16% protein, cornmeal is 8% protein. How many pounds of each should be mixed togeather in order to get a 320 lb mixture that is 14% protein?

Soybean=

Coenmeal=