That's going to depend on what information they give you, before
you come to the words "How long ..." .
There's no general rule. You just have to use your brain every time.
There's no way around it. Sorry.
to add, you multiply... to subtract, you divide... weird, huh? haha!
Divide.
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No. It means to find the value of. That can mean multiply, add, subtract, divide or more complicated stuff.
Any of them. To get 50 to 30 you could... subtract 20 add -20 divide by 5/3 multiply by 3/5
does how many mean add or subtract
Add then divide.
to add, you multiply... to subtract, you divide... weird, huh? haha!
Divide.
Divide.
it means to subtract
you can add subtract multiply and divide them.
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multiply divide answer subtract add
it can multiply,divide,add and subtract.
No.No.No.No.
No. It means to find the value of. That can mean multiply, add, subtract, divide or more complicated stuff.