Răspuns: 60%
Explicație pas cu pas:
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3/5 din 90km =
= 3/5 • 90 =
= 3•90/5 =
= 270/5 =
= 54
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54 din 90 <=>
<=> x% • 90/1 = 54 <=>
<=> x/100 • 90/1 = 54 <=>
<=> x/10 • 9/1 = 54 <=>
<=> x•9/10•1 <=>
<=> 9x/10 = 54/1 <=>
<=> 9x•1 = 10•54 <=>
<=> 9x = 540 <=>
<=> x = 540 ÷ 9 <=>
<=> x = 60 <=>
<=> x% = 60%
Succes! :)
--McRobert--
