To find out how much fuel is in Lena's car now, you need to add the amount of fuel she just put in to the amount that was already in the car.
Starting amount: 4.7 gallons
Fuel added: 24.32 gallons
Now, add the two amounts together:
\[ 4.7 + 24.32 = 29.02 \]
So, Lena's car now has 29.02 gallons of fuel.