L'âge de Jeanne est le triple de celui de Jacques La somme de leurs âges est 60 ans.
a) Désigne par y ans l'âge de Jacques, puis calcule y.
b) Quel est l'âge de Jeanne ?​

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.