Question

Daca $\frac{a}{b} = \frac{3}{5}$ si a+b=24 , atunci a×b = ....

Answer 1

 a / 3  = b / 5   = ( a + b) / ( 3 +5 ) = 24  / 8 =  3 
a / 3 = 3                 ; a = 9
b / 5 = 3                ; b = 15 
ab= 9 · 15 = 135