exam Maths Puzzle Numerical Ability

her score so far after 15holes is -2. if par for 15 holes is 63, what is her score?

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exam Other Question

Find the exact value of x if 7^x=3^5 I think the answer is 5log3/log7??? Could you check my answer please?

An 800 g solution of acid and water contains 128 g of acid. What percent of the solution is acid?

128/800 16