exam Maths Puzzle Numerical Ability

4-(2x-9)=-19

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exam Other Question
john traveled 40 mph to his friends house
on the return trip back home he traveled 45 mph
It took him 4hrs round trip
Question: What was the total distance traveled?

Thank you I need help with the following word problem from a 5th grade textbook:

The product of two decimal numbers is 8.12. The difference of the two numbers is 0.1. What are the two numbers?

Thank you,