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8 February, 14:27

Big Dig Diamond Company pulverizes 156 tons of rock for every 2 ounces of diamonds it finds. How many tons of rock must it grind up in order to locate 20 ounces of diamonds?

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  1. 8 February, 15:09
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    You could do it as 2*10=20 so you will have multiply 156 by 10, getting 1,560. The other way is by cross multilying the fraction 2/156 by 20/? and dividing the answer; 156*20=3,120/2=1,560.
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