Book Maths Puzzle Number System

Find two numbers whose sum is 64 and whose difference is 42.

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Book Other Question

Two planes leave O'Hare Airport in Chicago at the same time. One flies directly east at 540 mph. The other flies directly west at 720 mph. How long will it take them to be 1890 miles apart? Four years ago, Marion was 2/3 as old as Les was. Now she is 3/4 as old as he is. How old is each now?