exam Maths Puzzle Numerical Ability

please help me with this problem.
x^3/2=10.42

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exam Other Question

Can you help me solve: On a certain map, a field 280 ft long is represented by a 5 in. by 8 in. rectangle. How wide is the field? A 30% nickel alloy is to be melted with an 80% nickel alloy. How many grams of each must be used to obtain 50 grams of a 50% nickel alloy?