My dad is 64 years old and I am N years old. How old shall we be in x years’ time?
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Given:
Joey had 26 game cards.
His friend Richard gave him some more, and now Joey has 100 cards.
To find:
How many cards did Richard give to Joey?
Solution:
Let x be the number of cards that Richard give to Joey.
Joey had 26 game cards.
Now, the total cards joey has
Joey has total 100 cards.
Therefore, Richard gave him 74 cards.