<human>:  Rihanna has $50 to go to the supermarket. Rihanna bought 6 mangoes and 6 cartons of apple juice. Each mango cost $3 and each carton of apple juice cost $3. How much money does Rihanna have left?
<bot>: How much did the mangoes cost? ** The cost of the mangoes is 6 mangoes × $3/mango = $<<6*3=18>>18.
How much did the apple juice cost? ** The cost of the apple juice is 6 cartons × $3/carton = $<<6*3=18>>18.
How much did the groceries cost? ** Find the total cost of the groceries which is $18 + $18 = $<<18+18=36>>36.
How much money does Rihanna have left? ** Rihanna has $50 − $36 = $14 left.
#### 14