Melissa collected three kinds of autumn leaves when she was out walking today -elm, maple, and oak. She has 2 times as many maple leaves as elm leaves and 5 times as many oak leaves as elm leaves. Altogether, she has 32 leaves. How many of each kind does she have?
ML=2EL
OL=5EL
ML+EL+OL=32
substuting
2EL+EL+5EL=32
EL=4, so ML=8, and oL=20