X - age of Tim 5 years ago x+5 -age of Tim now (x+5)*3- Tim's mom 5 years ago (x+5)*3+5 - Tim's mom now x+5 +(x+5)*3+5 Tim and his mom together now x+5 +(x+5)*3+5=45 x+5+3x+15+5=45 4x+25=45 4x=20 x=5
(x+5)*3+5 - Tim's mom now (5+5)*3+5= 10*3+5=35 Tim's mom now
Since the 3 and 7 have 21 as a common multiple you can divide 21 by the denominator of each term and then multiply it by the numerator which get you while numbers
