book Maths Puzzle Numerical Ability

log (x+21) + log x = 2

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book Other Question

in a certain football league, the only ways to score are to kick a field goal for 3 points and score a touchdown for 7 points. How many positive scores cannot possibly be obtained by a team in this game? How much pure acid should be mixed with 2 gallons of a 40% acid solution in order to get a 70% acid solution?