Di's Problem Solving

I am learning to draw a picture to help me solve a problem.

The problem that I had to solve was:

Larenzo has 3 times as many marbles than Janet does. Janet has 7 marbles. How many marbles does Larenzo have?

We did a question for maths and we drew three boxes and we had seven dots in each box. We chose operations. We chose times. The answer was 21. I thought it was fun.