You call "a number" some variable name, for example "x", and then write:4 + x
or:
x + 4
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The sum of number and four times a number is 25 write in algebraic expression
4 - (x + 6)
sum= answer of an addition question.. so the number of the sum is the answer.
You cannot write an algebraic expression for that, you need an equation. The equation is n - 6 = 4
4(x)2