Respuesta :

If 2/3=0.666666667
If 5/7= 0.71428571428
Times those two numbers and equals to= 0.47619047642
Changed 2/3 by times it by 7/7
Because you want to get the same denominator for both fractions.

It would equal 8/21 time 15/21 = 120/21 (simply it too)