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three times a number increased by twenty
Write three as 3, and twenty as 20
3 times a number increased by 20
Write N instead of "a number"
3 times N increased by 20
Write 3N instead of "3 times N"
3N increased by 20
To increase by 20 is to add 20, and to add 20 we write + 20
So write "+ 20" insteda of "increased by 20"
3N + 20
That's it!
Edwin