exam Maths Puzzle Numerical Ability

IF A CERTAIN SOFT DRINK IS 97% CAFFEINE-FREE,HOW MANY SODAS WOULD YOU HAVE TO DRINK TO GET THE AMOUNT OF CAFFEINE FOUND IN A STANDARD SODA?

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exam Other Question

If fifteen less than two times a number is divided by six more than the number, the result is four less than 9 times the reciprocal of that number. Find the number Please help me solve the following problem:
Solve: x^2 + 3x - 4 = 0