The number which when added to its half gives 30. What is the number?
1 answer:
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Answer:
The model swing should be <u>2.75 cm</u> high.
Step-by-step explanation:
Given:
A 168-cm tall person is 2 cm in Ming’s model.
If the actual swing is 231 cm high.
Now, to find how high should his model swing be.
Let the model swing be
So, 168 cm tall person is equivalent to 2 cm.
Thus, 231 cm actual swing is equivalent to model swing.
Now, we get the height of the swing in the model by using cross multiplication method:
<em>By cross multiplication:</em>
⇒
<em>Dividing both sides by 168 we get:</em>
⇒
Therefore, the model swing should be 2.75 cm high.