10^x = 150; 6^y = 250; 20^z = 300

1)10ˣ=150
х=log₁₀150
2)6^у=250
у=log₆250
3)20^z=300
z=log₂₀300

х=㏒₁₀150=lg150 =lg15*10=lg15+lg10=lg15+1

y=㏒₆ 250 = ㏒₆ 25*10=㏒₆ 25 + ㏒₆ 10 =㏒₆ 5² +㏒₆ 10=2㏒₆ 5+㏒₆ 10

z= ㏒₂₀300 = ㏒₂₀15*20 = ㏒₂₀15+㏒₂₀20 =㏒₂₀15+1