Final answer:
Andre uses 24/40 teaspoon of sugar and 15/40 teaspoon of salt in all.
Step-by-step explanation:
To find out how much sugar and salt Andre uses in total, we need to add the amounts of sugar and salt together.
Andre uses 3/5 teaspoon of sugar and 3/8 teaspoon of salt.
To add these fractions together, we need to find a common denominator. The least common denominator of 5 and 8 is 40.
Converting 3/5 to have a denominator of 40, we get 24/40 teaspoon of sugar. Converting 3/8 to have a denominator of 40, we get 15/40 teaspoon of salt.
Adding these amounts together, Andre uses a total of 24/40 teaspoon of sugar and 15/40 teaspoon of salt.