Mary is twice older then her sister. In 5years time, she will be 2years older then her system. Find the age new.
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Answer:
Mary's new age =9
and her sister's new age =7
Step-by-step explanation:
let mary's sister's age be 'x'
Mary's age =2x
after 5 years Mary's age =2x+5
Mary's sister's age =x+5
Mary is two is older than her sister now
therefore Mary's sister's age =
2x+5=x+5+2
=2x+5=x+7
=2x-x=7-5
=x=2
Mary's sister's age before 5 yrs =2
Mary's age before 5 yrs =2×2=4
Mary's sister's age after 5 years =x+5=2+5=7
Mary's age after 5 years =2x+5=4+5=9
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