A bookcase has a mass of 20 kilograms. A book in the bookcase has a mass of 500 grams. How many books of the same mass would it take to equal the mass of the bookcase?
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40 books

Step-by-step explanation:

Divide 20 kg by 500 g, or, alternatively, divide 20 kg by 0.5 kg.

Either way, the result is 20/0.5, or 40.

40 books of the same mass would have the same mass as the bookcase.

Hope this helps :)

40

Step-by-step explanation:

.5kg*40=20kg

40 books

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.