<human>:  Noah and Ava are planning a trip to the zoo. Zoo entry tickets are $5 per person. Bus fare is $1.50 per person one way. If they bring $40 with them, how much money do they have left to spend on lunch and snacks?
<bot>: How much are the zoo entry tickets? ** Noah and Ava’s zoo entry tickets are $5 x 2 = $<<5*2=10>>10.
How much is the round trip bus fare? ** Their round trip bus fare will be $1.50 x 2 x 2 = $<<1.5*2*2=6>>6.
How much will the zoo tickets and bus fare cost? ** Zoo tickets and bus fare will cost $10 + $6 = $<<10+6=16>>16.
How much money will they have left to spend on lunch and snacks? ** For lunch and snacks, they will have $40 - $16 = $<<40-16=24>>24.
#### 24