Question

calculati termenul necunoscut al proportiei x/25 egal 4/10

Answer 1

x/25 = 4/10
10x = 100
x = 100:10
x = 10

Answer 2

x/25=4/10=> facem predusul mezilor, apoi il impartim la un extrem
x=25x4:10=100:10=>
x= 10