90 marbles are shared among 3 friends. Dave gets 10 more than Lall, who gets 10 more than lee. How much does dave get?

If Dave gets 40, then Lall gets 30, and Lee gets 20.

Yep, that checks!

I'll be glad to check your answer.

40

thank u Ms. Sue

You're welcome, Joshua.

method:

lee ---- x
lal ---- x+10
dave --> (x+10) + 10 = x+20

x + x+10 + x+20 = 90
3x = 60
x = 20

etc

To find out how many marbles Dave gets, we need to follow the information given in the problem.

Let's assume that Lee receives x marbles.

According to the problem, Lall receives 10 more marbles than Lee, which means Lall receives (x + 10) marbles.

Similarly, Dave receives 10 more marbles than Lall, so Dave gets ((x + 10) + 10) marbles or (x + 20) marbles.

We know that the total number of marbles is 90, so we can set up an equation to solve for x:

x + (x + 10) + (x + 20) = 90

Now we can solve the equation to find the value of x:

3x + 30 = 90
3x = 90 - 30
3x = 60
x = 60 / 3
x = 20

Therefore, Lee gets 20 marbles, Lall gets (20 + 10) = 30 marbles, and finally, Dave gets (20 + 30) = 50 marbles. So, Dave gets 50 marbles.