of the third graders who were asked, 2/5 like pizza the best, 3/15 like hamburgers the best, and 18 like macaroni the best. How many third graders were asked their favorite food?

1 - 2/5 - 3/15 = 6/15 = 2/5 liked macaroni best

18 is 2/5 of 45.

45 is the answer

38 is the answer

I believe the answer is 38

38

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To find the total number of third graders who were asked about their favorite food, you need to add up the fractions and the given whole number.

First, find the common denominator for the fractions. The least common multiple (LCM) of 5 and 15 is 15.

Now let's convert the fractions to have the same denominator:

2/5 = 6/15 (multiply the numerator and denominator of 2/5 by 3)
3/15 = 3/15

Now add the fractions:

6/15 + 3/15 = 9/15

Finally, add the whole number:

9/15 + 18 = 27/15

To simplify 27/15, find the greatest common divisor (GCD) of the numerator and denominator, which is 3. Divide both the numerator and denominator by 3:

27/15 = (27 ÷ 3) / (15 ÷ 3) = 9/5

So, the total number of third graders who were asked about their favorite food is 9/5, or 1 and 4/5. However, since third graders cannot be fractionally counted, you should round up to the nearest whole number.

Therefore, the estimated number of third graders who were asked about their favorite food is 2.