algebraic expressions - equation

Question

algebraic expressions - equation

(Write down an equation connecting the unknown)

3.Rose's money is less than half of Mary's by $120.Rose has $39.

Let $x be the amount that Mary has.

And also,It is the best to explain the answers and the questions.

Answer 1

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Let $x be the amount that Mary has

x/2 - 120 = 39

x/2 = 159

x = 318

Hence, Mary has $318