Question

an alloy consists of 30% zinc, 45% Nickel and the rest copper. find the mass of copper in 400 gram of alloy

Answer 1

Let the percent of zinc be x.  Then, 40% + 32% + x%= 100%  72% +x%= 100%  x%= 100%- 72%= 28%  Mass of given alloy= 1 kg  Mass of zinc in the alloy= Percent of zinc × mass of alloy  28/100 × 1= 0.28 kg (Answer