isaacadelson
isaacadelson isaacadelson
  • 24-03-2015
  • Mathematics
contestada

15 is 10% of what number, and 18 is 60% of what number?

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secret13 secret13
  • 24-03-2015
15 ÷ 10 
15 ÷ 0.1 
150

15 is 10% of 150
-----------------------------------
18 ÷ 60 
18 ÷ 0.6 
30

18 is 60% of 30
Answer Link
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  • 24-03-2015
10x/100=15
x/10=15
x=15·10
x=150

60x/100=18
3x/5=18
3x=18·5
3x=90
x=30
Answer Link

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