Which algebraic translation correctly represents: "There are eight more nickels than dimes," if d represents the number of dimes and n represents the number of nickels?

What is the correct decimal to use for 37.5% when inserting a percent into a mixture equation?

Which equation correctly models the following situation: $x$ liters of 6% saline mixed with $y$ liters of 14% saline creating a 10 liter solution of 9% saline?

Miles has \$2.20 in dimes and nickels. He has eight more nickels than dimes. How many dimes and nickels does he have?

A fundraiser sold 300 tickets: child tickets \$6, adult tickets \$10, senior tickets \$8. Seniors equal half the number of children. Revenue was \$2,400. Find the number of each ticket type.