exam Maths Puzzle Numerical Ability

Two cars enter the Florida Turnpike at Commercial Boulevard at 8:00 AM, each heading for Wildwood. One car's average speed is 10 miles per hour more that the other's. The faster ca

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Q: log x + log 20=2. Then x =

By using the calculator I know that x=5
How would I work this problem without a calculator? Usinng this formula : logb2=0.310, logb3=0.4771, and logb5=0.6990 slove
log5 135 and rounded 4 decimals