A website Maths Puzzle Numerical Ability Log and Antilog

If log5(x2+x)-log5 x=2,then the value of x is

a. 24 b.25 c.23 d.120

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log5 (x2+x)-log5 x=2 log5 (x2+x)/x=2 5log5 (x+1)=5 ki power 2 x+1=25 x=25-1=24
6 years agoHelpfull: Yes(0) No(1)

A website Other Question

P, Q & R are assigned a work. Working together, they can complete a job in 10 days. However, R worked for only first 3 days and 37/100th of the total work was completed in these 3 days. Remaining work is completed by P & Q in 7 days. The work done by P in 5 days is equal to work done by Q in 4 days. Then the time taken by fastest worker is how much percent less than the second fastest worker? how to find 10^(3/4) without calculator?