Question

Revi and Ariana collect semi-precious stones. At the Rockhound Hut, Ariana paid $24 for 7 pounds of snowflake obsidian. At The Solid Rock Shop, Revi paid $19 for 4 pounds of the same type of stone. Who made the better buy?

Answer 1

Ariana made-$3.43 per pound
Revi made - $4.75 perpendicular
$3.43<$4.75
So Ariana made the better buy