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The difference of 2 numbers is 21 and the quotient of the equation is 4 then what are the two numbers?

Henry is an avid reader, he devours 90 pages in half an hour how many pages has henry read per minute?

Three baby penguins and their father were sitting on an iceberg 0.50.50, point, 5 meters above the surface of the water. the father dove down 4.74.74, point, 7 meters from the iceberg into the water to catch dinner for his kids. what is the father penguin's position relative to the surface of the water?