isaacadelson isaacadelson

24-03-2015
Mathematics

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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

0000000 0000000

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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