Question

Please explain. I need to work it out.

Answer 1

a=3m, j=2a, and a+m+j=840
so that means j=2(3m)
which means 3m+m+2(3m)=840 aka 10m=840 aka m=84, so maria picked 84 pounds
a=3m aka a=3(84) which means andre picked 252 pounds
lastly j=2a aka j=2(252) which means jane picked 504 pounds.