Question
Risa, Yen, Tommy and Mary shared some erasers. Risa and Yen took 13 of the total number of erasers while Tommy and Mary took the rest. Yen had four times as many erasers as Risa and Mary had 72 erasers. Given that Mary had twice as many erasers as Yen, how many erasers were there altogether?
4 m

Click button first when a symbol is required. X

Risa, Yen, Tommy and Mary shared some erasers. Risa and Yen took 13 of the total number of erasers while Tommy and Mary took the rest. Yen had four times as many erasers as Risa and Mary had 72 erasers. Given that Mary had twice as many erasers as Yen, how many erasers were there altogether?