Question

raportul a 2 nr naturale este 5/7,iar suma lor este 60,atunci produsul lor este?

Answer 1

a/b = 5/7 => a = 5b/7

a+b = 60 => 5b/7 +b = 60 => 5b+7b = 420 => 12b = 420 => b = 420:12 => b = 35

a = 60-b = 60-35 = 25 sau a = 5x35/7 = 25 => a = 25

axb = 25x35 = 875

Answer 2

a/b=5/7
a+b=60
a=60-b
60-b/b=5/7
7*(60-b)=5b
420-7b=5b
420=12b
b=35
a=60-35=25
a*b=25*35=875