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Anthony has 63 toy cars and 84 toy trucks. He wants to divide them into groups that contain the same number of vehicles. Also, each group must contain the same type of vehicle. What is the largest number of toys that can be put into each group?
##21##
##LCD ( 63,84)## (i.e. largest common divisor) ##= 21##
He could have ##3## groups of ##21## cars and ##4## groups of ##21## trucks.