Answered

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mary is twice older than her sister in 5 years time, she will be 2 years older than her sister. find how old they both now ?

Sagot :

Answer:

Mary is 4 and her sister is 2

Step-by-step explanation

We can denote Mary's sister as x and Mary as 2x

M's Sister: x

Mary: 2x

They said in 5 years she will be 2 years older.

In 5 years

M's Sister: x+5

Mary: (x+5)+2

Now we create an equation

2x+5=(x+5)+2

2x+5=x+5+2

2x+5=x+7

Subtract 5 from both sides

2x=x+2

Subtract x from both sides

x=2

So now Mary's sister is 2 and Mary is 4.

Check:

2+5=7

4+5=9

9-7=2

So the answer is correct.

Hope this helps.

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