Book Maths Puzzle Percentage

What percent of 1800 is 400?

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Book Other Question

If the original number is 2400 and you need to find 3 numbers to equal that number, one being 25% higher than the remaining 2 which are equal. How do I calculate that and get the answer? A person invested $2,000, part at 7% and part at 8% simple interest. If the total yearly interest from these investments was $154, how much was vested at each rate? How many gallons of a 70% alcohol solution must be mixed with 30 gallons of a 15% alcohol solution to obtain a solution that is 60% alcohol?