Use a variable to represent the situation. For example:
John is 10 years older than Frank.
Frank would be represented by x
John is x+10
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A "wry grin" is an expression which means the person thinks that something, although not particularly pleasant, is still somewhat humorous. A wry expression is often used when a situation is ironic.
An unknown variable
If x is used to represent the unknown number, then the expression for 20 times a number would be 20x.
1
seven t over two