There are 15 students on the debate team. Of these, 3 are boys. Give the ratio of boys to girls on the debate team. Give your answer in simplest form, type your answer as a fraction example 1/2 Numerator/Denominator.

Awater holding tank measures 105 m long, 50 m wide, and 8 m deep. traces of mercury have been found in the tank, with a concen- tration of 60 mg/l. what is the total mass of mercury in the tank? answer in units of kg.