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I have three systems of equations word problems. Can you help me?

**#1:**

The sum of three numbers is 32. The largest if 4 times the smallest. The sum of the two smaller numbers is 8 less than the largest. What are the numbers?

I have tried to model this one.

I got:

_ + _ +_ = 32

Largest = 4S

Sum of the two smaller #S = L-8

Then I don't know what to do from there and got lost.

**#2:**

Dat is 10 years older than David. 38 years ago, he was twice as old as him. How old is David now?

This was one of my equations that I tried to come up with:

Y = D+10

Y = 2D + 38

Yeah, it doesn't really add up and so I don't really know what do with it.

**#3:**

Tiffany has 34 animals. She has 3 times as many birds as cats. She has 4 times as many cats as dogs. How many of each does she have?

For this one I got:

34 = B+C+D

Birds = 3C

Cats = 4D

Then I got put into a loop of plugging in values, so I need help building the equations with this one too.

Please help me!