Question

How do you translate "one-hundred times a number K decreased by twenty" into a mathematical expression?

Answer 1

`100*K-20`

Explanation:

Let we divide the expression in two parts

(i) One hundred times a number K
(ii) decreased by twenty

(i)
One hundred means 100, times means "multiplied by" `*` a number K means the number is K.
That means one hundred multiplied by K.
`implies 100*K`

(ii) decreased means subtracted `-` by twenty means `20`
`implies -20`

So the full expression becomes `100*K-20`.