Which equation represents this statement? one-third of a number is 21.

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

Need solving this second acceleration problem.

Write the fraction 9/50 as a decimal if needed round to the nearest hundredth