Evaluate when a=15:2(a-5)+2

Can u guys do this ratio question. this is extremely urgent a tap is leaking water at a rage of 1l every 8 hours. how long will it take for the tap to leak a total of 300ml?

Polygon abcde is reflected to produce polygon a′b′c′d′e′. what is the equation for the line of reflection?

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.