solvarmedw

2022-09-07

One number is 1/2 of another number. The sum of the two numbers is 21. Find the two numbers. Use a comma to separate your answers.

Alvin Preston

Beginner2022-09-08Added 9 answers

Let 2 numbers be x and y

$$x=\frac{y}{2}\phantom{\rule{0ex}{0ex}}x+y=21$$

These equations are given so

$$\frac{y}{2}+y=21\phantom{\rule{0ex}{0ex}}\frac{3y}{2}=21\phantom{\rule{0ex}{0ex}}y=\frac{42}{3}\phantom{\rule{0ex}{0ex}}y=14$$

So $$x=\frac{y}{2}=7$$

So no are 7 and 14

$$x=\frac{y}{2}\phantom{\rule{0ex}{0ex}}x+y=21$$

These equations are given so

$$\frac{y}{2}+y=21\phantom{\rule{0ex}{0ex}}\frac{3y}{2}=21\phantom{\rule{0ex}{0ex}}y=\frac{42}{3}\phantom{\rule{0ex}{0ex}}y=14$$

So $$x=\frac{y}{2}=7$$

So no are 7 and 14

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