Answer:
16
Step-by-step explanation:
We are given the expression: 
2/5g+ 3h - 6 
We know that g=10 and h=6. Therefore, we can substitute 10 and 6 into the expression and solve according to PEMDAS( Parentheses, Exponents, Multiplication, Division, Addition, Subtraction)
2/5(10)+3(6)-6 
First, multiply 2/5 and 10 
4+ 3(6)-6 
Next, multiply 3 and 6 
4+18-6
Next, add 4 and 18 
22-6 
Finally, subtract 6 from 22 
16 
2/5g + 3h - 6 when g=10 and h= 6 is 16.