Well if he made 10 in 4 hours, that means he made 5 in 2 hours. after 2 hours he had 30 cards, so that means he started with 25 cards. Mr. Cringle is making 2 and 1/2 cards per hour.
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Step-by-step explanation:
try the option shown in the attachment, note, all the answers are marked with red colour.
Answer:
yes
Step-by-step explanation: