2 to 10 by __ to get the ratio 4 to 20

Antonia and carla have an equivalant percentage of green marbles in their bags of marbles. antonia has 4 green marbles and 16 total matbles. if carla has 10 green marbles , how many total marbles does carla have

Seymour is twice as old as cassandra. if 16 is added to cassandra’s age and 16 is subtracted from seymour’s age, their ages become equal. what are their present ages? show !

Rose bought a new hat when she was on vacation. the following formula describes the percent sales tax rose paid b=t-c/c