Jacob wants his aquarium area to have 18fish. each tank has 3 fish. his father gave him 2 fish tank and his mother gave him 3 fish tanks as a gift. how many more fish tanks does he need to fill the aquarium area?

One more fish tank,..
because 3+2=5and 3 fish in each tank so 5×3=1518-15=3so he had 3 fish left overwhich would fit in exactly 1 more fish tank.

Jacob needs 1 more aquarium beacuse 3plus3plus3plus3plus3equal 15 so then one more gives you 18

It's like discovering the answer to a puzzle. the purpose in solving an equation is to find the value or values of the variable that makes it a true statement. any value of the variable that makes the equation true is called a solution to the equation.