30. The average age of 20 boys is 15. Find their total age.
B.35 years
A. 20 years
D. 300 years
C. 5 years

For how answer my question this will be the last question can you answer in math subject

The magnitude, m, of an earthquake is defined to be m=log l/s, where i is the intensity of the earthquake (measured by the amplitude of the seismograph wave) and s is the intensity of a “standard” earthquake, which is barely detectable. what is the magnitude of an earthquake that is 1,000 times more intense than a standard earthquake? use a calculator. round your answer to the nearest tenth.

What is the result of adding the system of equations? 2x+y=4 3x-y=6