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Mike is three times as old as his little sister, Mary. In 4 years, he will be twice as old as Mary. How old is Mary?

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Accepted Answer

Mary: x yrs oldMike: 3x yrs oldIn four yrs:Mary: x+4 yrs oldMike: 3x+4 yrs oldAs the text of task:3x+4=2(x+4)3x+4=2x+83x-2x=8-4x=4Mary is 4 yrs old

Accepted Answer

x-the age of Mikey-the age of his sisterx=3yx+4=2(y+4)3y+4=2y+83y-2y=8-4y=4 yearsx=3*4=12 years

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