jika x/12=1/6 dan 2/5y=1/10 maka 2/x+1/y=

[tex]\displaystyle \frac{x}{12}=\frac{1}{6} \\ 6x=12 \\ x=2 \\ \\ \frac{2}{5y}=\frac{1}{10} \\ 20=5y \\ y=4 \\ \\ \frac{2}{x}+\frac{1}{y}=\frac{2}{2}+\frac{1}{4}=\frac{4+1}{4}=\frac{5}{4}[/tex]

x/12 = 1/6
x = 1/6  *  12
x  = 2
2/5y = 1/10
5y = 2/(1/10)
5y = 20
y = 4
maka 2/x + 1/y = 2/2  +  1/4  = 5/4 = 1 1/4