document.write( "Question 578083: Riza is 25 years old while her brother was born. After the sum of their ages is 105. What is the age of riza and her brother today? \n" ); document.write( "
Algebra.Com's Answer #370569 by ankor@dixie-net.com(22740)\"\" \"About 
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let r = R's age
\n" ); document.write( "let b = bro's age
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\n" ); document.write( "Riza is 25 years old while her brother was born.
\n" ); document.write( "From this statement we can say:
\n" ); document.write( "r = b + 25
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\n" ); document.write( "Now the sum of their ages is 105, what is their present age?
\n" ); document.write( "r + b = 105
\n" ); document.write( "replace r with (b+25), find b
\n" ); document.write( "(b+25) + b = 105
\n" ); document.write( "2b = 105 - 25
\n" ); document.write( "2b = 80
\n" ); document.write( "b = 80/2
\n" ); document.write( "b = 40 yr is brother's present age
\n" ); document.write( "then
\n" ); document.write( "25 + 40 = 65 yrs is Riza's present age
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\n" ); document.write( ":
\n" ); document.write( "Check this by adding up their ages, and seeing it equals 105\r
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