book Maths Puzzle Numerical Ability

CD=6 and AD=4 then DB=?

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book Other Question

Graph y = 2x - 3 A store keeper goes to the bank to get $10 worth of change. He requests twicew as many quarters as half dollars, twice as many dimes as qurters, 3 times as many nickles as dimes, and no pennies or dollars. How many of each coin did the storekeeper get?