exam Maths Puzzle Numerical Ability

the promethus fountain in new york city pumps 60,000 gallons of water every 15 minutes. what is the unit rate

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tom has a collection of 30 cds and nina has a collection of 18. tom is adding cds a month to his collection while nina is adding 5 cds a month. write and graph a system to find the Trisha is on vacation. She sends letters and postcards to her friends at home. she needs 33 cents in postage for each letter and 20 cents for each postcard. she spends $3.58 in postage. how many letters and postcards did she send?