Condition on 4 numbers

I have two variables which must display an integer.

The two variables must be in 2 ranges 30...40 and 60...80

For example:

If the first number displays 35 and the second number 65. The condition is true.

Another example:

If the first number displays 35 and the second 110, the condition is false.

My problem is that for the first number, I initialize the value to 35 and the second to 65 and I obtain a false instead of true.

let nb1 = 35;
let nb2 = 65;

if( (nb1 >= 30 && nb1 <= 40 && nb1 >= 60 && nb1 <= 80)  && (nb2 >= 30     
    && nb2 <= 40 && nb2 >= 60 && nb2 <= 80)  ){
  console.log(true);
 } else {
  console.log(false);
}

What is wrong with my condition?

Thank you

>Solution :

The number can’t be in both ranges simultaneously, you need to use an or condition:

 let nb1 = 35;
 let nb2 = 65;

 if(((nb1 >= 30 && nb1 <= 40) || (nb1 >= 60 && nb1 <= 80)) && ((nb2 >= 30     
        && nb2 <= 40) || (nb2 >= 60 && nb2 <= 80))){
     //condition(s) are met
     console.log(true);
 } else {
     console.log(false);
 }