the length of an aluminum is 76.5cm and that of an iron ruler is 80cm at 0 degree celsius at what temperature will the length of the rules become

Answer 1

lengthAl=alengthFe
76.5(1+coeffAl(deltaTemp))=80(1+coeffFe(deltatemp)
76.5/80 (1+coeffAl*deltaT)= (1+coeffFe(deltatemp)
76.5/80 +76.5/80 *coeffAl*deltaT)= 1+coeffFe(deltatemp)
deltaTemp (76.5/80*coeffAl-coeffFe)=1-76.5/80
solve for delta Temp
check my math.