Question 1024863
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Huilan is 7 years older than Thomas. The sum of their ages is 65. What is Thomas's age?
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H - T =  7,   (1)
H + T = 65.   (2)


Add (1) and (2). You will get

2H = 65 + 7 = 72.

Hence, H = {{{72/2}}} = 36.  It is Huilan present age.
Then Thomas present age is 36 - 7 = 29 years.
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