book Maths Puzzle Numerical Ability

Problem: 2c divided by 3b, where b = 4 and c = 6. I say the answer is 1, the text I was using shows the answer as 16? I believe it to be a misprint. What is the correct answer?

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book Other Question

During a sale, the price of a book is reduced by 25%. The sale price is then further reduced by 40%. The cost of the book as a percentage of the original price is? Find all the solutions of the equation. Check your soulutions in the original equation.

x^4-x^3+x-1=0