Answer:
a) $ 3x
Step-by-step explanation:
- The amount of money Andrew has: $x
- The amount of my Billy has :
He has thrice the amount of money that Andrew has with him.
So, Billy's amount of money is ⇒ 3 × x = $3x
- The amount of money Charlie has :
He has $ 11 more than Billy.
So, Charlie's amount of money is ⇒ $ 3x + 11
Therefore,
( a ) $ 3x