exam Maths Puzzle Numerical Ability

Please help me solve this word problem:

The ratio of dogs to cats in the U.S. is 3 to 5. If there are 4,097,500 cats in the U.S., how many dogs are there?

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exam Other Question

Determine which two equations represent perpendicular lines.
y = 4/7x-3
y = 3x-4/7
y =-1/3x+4/7
y =1/3x-3 4/7
You rent a booth at the carnival for $200. You are sellin turkey legs for $2.50 each. By the end of the carnival you made $650 in profit. Write an equation that can be used to find