exam Maths Puzzle Numerical Ability

A purchase of 5 oranges and 6 bananas is 2.05 and a purchase of 7 oranges and 8 bananas is 2.79. What is the cost of each orange?

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a researcher orders a broth 40.2% glucose for her lab. However, she needs a stronger broth, one that is 50.1% glucose. She has 16.1 liters of 57% glucose broth in the stock room. How much 50.1% glucose broth can she make? Hi could you help me figure out this word problem?

The electric current I in amperes of a circuit is given by the formula log base 2 of I=-t. Find the current when t is 3s.

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