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Sarah is 16 years old. Her brother is x years old. She is four times as old as her brother, so 4x = 16. Divide each side by 4, so x = 16/4 = 4. Her brother is 4 years old.

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Q: Sarah who is sixteen years old is four times as old as her brother?
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Mary is sixteen and is four times as old as her brother how old is the brother?

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Mary who is sixteen years old is four times as old as her brother. How old will Mary be when she is twice as old as her brother?

Mary will be 24 and her brother will be 12 !


Sarah is sixteen years old and four times as old as her brother How old will Sarah be when she is twice as old as her brother?

She will be 24.S=16 (Sarah is 16 years old)S=4B (Sarah is 4 times as old as her brother)S/4=B16/4=BB=4 (Sarah's brother is 4 years old)How old will Sarah be when she is twice as old as her brother?S+Y=2(B+Y); S= Sarah's age, B= Sarah's Brother's age, Y=years passed16+Y=2(4+Y)16+Y=8+2Y16=8+2Y-Y16=8+Y16-8=Y8=Y (Sarah will be twice as old as her brother after 8 years pass)How old is Sarah after 8 years pass?S+Y=Final Answer16+8=24Checking work:B+Y=4+8=12Is 12 half of 24? Yes.Therefore Sarah will be twice her brothers age when she is 24 and her brother will be 12.-------------------The keys here areSarah's age S = 16Sarah's brother's age B = 16/4 = 4Years that pass = TThe equation isSarah's future age is twice her brother's future age16+T = 2 (4+T)16+T = 8 +2T16 = 8+2T - T16 = 8 + T8 = TSarah's future age = 16 + T = 24


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Related questions

Mary is sixteen and is four times as old as her brother how old is the brother?

her brother is 4 years old


Mary who is sixteen years old is four times as old as her brother. How old will Mary be when she is twice as old as her brother?

Mary will be 24 and her brother will be 12 !


Sarah is sixteen years old and four times as old as her brother How old will Sarah be when she is twice as old as her brother?

She will be 24.S=16 (Sarah is 16 years old)S=4B (Sarah is 4 times as old as her brother)S/4=B16/4=BB=4 (Sarah's brother is 4 years old)How old will Sarah be when she is twice as old as her brother?S+Y=2(B+Y); S= Sarah's age, B= Sarah's Brother's age, Y=years passed16+Y=2(4+Y)16+Y=8+2Y16=8+2Y-Y16=8+Y16-8=Y8=Y (Sarah will be twice as old as her brother after 8 years pass)How old is Sarah after 8 years pass?S+Y=Final Answer16+8=24Checking work:B+Y=4+8=12Is 12 half of 24? Yes.Therefore Sarah will be twice her brothers age when she is 24 and her brother will be 12.-------------------The keys here areSarah's age S = 16Sarah's brother's age B = 16/4 = 4Years that pass = TThe equation isSarah's future age is twice her brother's future age16+T = 2 (4+T)16+T = 8 +2T16 = 8+2T - T16 = 8 + T8 = TSarah's future age = 16 + T = 24


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