\begin{array} { l } { \text { The sum of the present ages of } A \text { and } B \text { is } } \\ { 110 \text { years. } 20 \text { years ago, ratio of their ages } } \\ { \text { was } 4 : 3 . \text { Find the age of } A . } \\ { \text { (1) } 60 } \\{\ text {2} } 55 }\\ { \text { (3) } 50 } \\{\ text {4} } 35} \\ { \text { (5) of these } } \end{array}

\begin{array} { l } { \text { The sum of the present ages of } A \text

1.	\begin{array} { l } { \text { The sum of the present ages of } A \text { and } B \text { is } } \\ { 110 \text { years. } 20 \text { years ago, ratio of their ages } } \\ { \text { was } 4 : 3 . \text { Find the age of } A . } \\ { \text { (1) } 60 } \\{\ text {2} } 55 }\\ { \text { (3) } 50 } \\{\ text {4} } 35} \\ { \text { (5) of these } } \end{array}
Answer» A+B=11020 years agoA+B=110-20-20=70now A:B=4:3so A=4B/34B/3+B=707B/3=70so B=30 so A=40so current age of A=40+20=60 years.