A factory produces 209214 dolls every month. It sends 10403 dolls to the town market, 75650 dolls to markets in other states and 52478 to markets in other countries. How many dolls are left with the factory?
There are two teams of two people each competing in a relay race. The race is for 1km, and each member of a team has to run 500 meters Cassandra and Laura are in one team, and the Alexia twins form the second team. Cassandra can run 500 meters in
minutes. Laura can run 500 meters in
minutes. Each of the Alexia twins can run 500 meters in
minutes. Which pair wins the race and by how much time?