Question

Alexa bought 7 books about animals, 2 books about outer space, and 10 books about trains. Each book cost $3. How much did Alexa spend on the books?

Answer 1

The answer is $57

Take the total of books she bought (7+2+10= 19)and then multiply that by $3 (19*3=$57)

Answer 2

7×3=21
2×3=6
10×3=30

21+6+30=57