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Answer:
Her aunt buy <u>75</u> trucks.
Step-by-step explanation:
Given:
Henry had 20 convertibles and 5 trucks in his miniature car collection. After Henry's aunt bought him some more miniature trucks, Henry noticed that a fifth of his collection were convertible.
Now, to find the trucks her aunt buy.
Let the total collection of Henry be
<em>Number of trucks Henry had in his collection = 5.</em>
<em>Number of convertibles Henry had in his collection = 20.</em>
As, Henry's collection were convertible.
Now, to get the total number of collection:
<em>Multiplying both sides by 20 we get:</em>
<em>Total collection of Henry = 100.</em>
So, the total number of trucks he had in his collection is:
<u><em>Total collection of Henry - number of convertibles Henry had in his collection.</em></u>
<em>Hence, Henry had total 80 trucks in his collection.</em>
<em>And 5 trucks he had already in his miniature car collection.</em>
Now, to get the number of trucks her aunt buy we subtract trucks he had already in his miniature car collection from the total number of trucks in Henry's collection:
<u><em>Total number of trucks in Henry's collection - Number of trucks already in his miniature car collection.</em></u>
Therefore, her aunt buy 75 trucks.