a container and a jug had a total of 2.15 quarts of oil in them. When 0.18 quart of oil…

a container and a jug had a total of 2.15 quarts of oil in them. When 0.18 quart of oil was poured from the container into the jug, the container had 4 times as much oil as the jug. how many quarts of oil were in the container at first?