The ratio of ages of two persons $A$ and $B$ is $3:4$ and that of ages $B$ and $C$ is $4:5$. If the average of all three is $40$ years, what is $B$’s age?

The following table shows total number of students in the Department of the Institute along with percentage of Females and Male students. Answer the question based on the data given below: ... the number of females in Mechanical Department to the number of females in Electronics Department? $4:3$ $23:22$ $24:21$ $23:21$

The following table shows total number of students in the Department of the Institute along with percentage of Females and Male students. Answer the question based on the data given below: ... $2210$ $3210$ $3400$ $3310$

The following table shows total number of students in the Department of the Institute along with percentage of Females and Male students. Answer the question based on the data given below: ... $266$ $886$ $786$ $686$

The following table shows total number of students in the Department of the Institute along with percentage of Females and Male students. Answer the question based on the data given below: ... Electrical departments together to the number of males in the same departments together? $311: 270$ $329:261$ $411:469$ $311 : 269$