gaby638ozy760 gaby638ozy760
  • 25-11-2017
  • Mathematics
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I need help please ?????

I need help please class=

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Plasmataco
Plasmataco Plasmataco
  • 25-11-2017
You need to memorize a formula for these kind of problems:
Total/(A+B)*B
Where total means total substance(in this case 869)
A means other substance ratio(in this case 7)
B means substance ratio of amount you are trying to solve for(in this case 4)
869/(7+4)*4=316
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