Question

O roata face 144 rotatii in 6minute . In cate minute face 432 de rotati

Answer 1

144:6=24
432:24=18 minute

Answer 2

Regula de 3 simplă:
144 rotatii ....... 6 minute
432 rotatii ....... x minute

=>
$\frac{144}{432} = \frac{6}{x}$
Apoi, produsul miezilor = produsul extermilor
144*x = 6*432 = 2592
=> x = 2592 / 144 = 18
=> 18 minute