Answer:
25+x=y
Step-by-step explanation:
First, we start as 25, the number of cards he has in his collection. Then we add x, the cards he receive. The sum is y.
Answer: The answer is d.
Karin can fold 7, 14 and 21 paper cranes in 1, 2 and 3 hours respectively.
Please kindly see the attached for explanation.