Math  /  Algebra

QuestionLamar and his sister take turns mowing the lawn. Because he is older, Lamar has to mow 5 times for every 4 times his sister mows.
Pick the diagram that models the ratio in the story.
Lamar mowed the lawn 3 more times than his sister last summer. How many times did Lamar mow last summer? \square times
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Studdy Solution

STEP 1

What is this asking? We need to figure out how many times Lamar mowed the lawn last summer, knowing he mows 5 times for every 4 times his sister mows, and that he mowed 3 more times than her. Watch out! Don't mix up Lamar's mowing turns with his sister's!
Keep track of who mows how many times.

STEP 2

1. Visualize the Ratio
2. Find the Difference
3. Calculate Total Mows

STEP 3

Let's imagine the mowing turns visually!
For every 5 times Lamar mows, his sister mows 4 times.
We can think of this as groups of mows.
In each group, Lamar mows 5\text{5} times, and his sister mows 4\text{4} times.

STEP 4

Within each group of mowing turns, how many more times does Lamar mow than his sister?
Well, that's 54=15 - 4 = 1 time.
So, in each group, Lamar mows 1\textbf{1} more time than his sister.

STEP 5

We know Lamar mowed 3\textbf{3} more times than his sister last summer.
Since each group of turns has Lamar mowing 1\textbf{1} time more than his sister, and he mowed a total of 3\textbf{3} times more, there must have been 31=3\frac{3}{1} = 3 groups of mowing turns.

STEP 6

Now, since there are 3\textbf{3} groups, and Lamar mows 5\textbf{5} times in each group, he mowed a total of 35=153 \cdot 5 = 15 times last summer.
Awesome!

STEP 7

Lamar mowed the lawn 15\textbf{15} times last summer.

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