WINTER HOLIDAY HOMEWORK [Ch.20 Q1]

Level pending

In a restaurant, there are Chinese meal, Western-style food and the cooked wheaten food. Each type of meal have 3 choices. How many chioces do we have? If Peter choose Chinese meal 1, it has 3 choices of staple food, 2 choices of snack and 3 choices of juice. How many choices does Peter have?

A: 3, 8

B: 9,8

C: 9,18

D: 3, 18

B D C A

Elaine Zhang by Elaine Zhang , 20, China

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1 solution

Elaine Zhang
Feb 11, 2015
  1. ADDITION: each three have 3 choices, add them together: 3+3+3=9

We add them together is because we need to choose one from 9 meals.

  1. MULTIPLICATION: we need to choose one from each staple food, snack and juice, so we need use multiplication: 3x2x3=18
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