Answer the following question:
A brass alloy contains \(70\) \(\%\) copper by mass. Calculate the quantities of copper and zinc present in 150 \(g\) of brass.
Total mass of brass \(=150 \) \(g\)
Mass percentage of copper \(=\ 70 \%\)
Mass percentage of zinc = \(%\)
Mass of copper = \(g\)
Mass of zinc = \(g\)
[Note: Enter your answer in whole number]