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MrRissso [65]
3 years ago
9

Seventy-eight is 26% of what number?

Mathematics
1 answer:
tensa zangetsu [6.8K]3 years ago
8 0
78 / 0.26 = 300 so the answer is 300
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Using your own words, explain direct and inverse proportionality. (Be sure to use complete sentences.)
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What is the answer 5(x-4)=3x+4
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Step-by-step explanation:

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tigry1 [53]
Let:     x be Amy's marbles
         3x be Robin's marbles
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x+3x+15+3x=99
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                7x=99-15 (transfer 15 to the right side of the equation, then minus)
             7x/7=84/7 (divide both sides of the equation by 7)
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Now substitute:
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   15+3x  = 15+3*12 =  51 (Sam's)
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Therefore, Amy has 12 marbles, Robin has 36 marbles and Sam has 51 marbles.
5 0
3 years ago
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