Postal Government Jobs Exams Numerical Ability Ratio and Proportion

In a class,the number of boys and girls are in the ratio 4:5. If 10 more boys join the class,the ratio of numbers of boys and girls become 6:5. How many girls are there in the class?

(a)20
(b)30
(c)25
(d)none of these

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Postal Other Question
A tank is 7 m long and 4 m wide.At what speed should water run through a pipe 5 cm broad and 4 cm deep so that in 6hr and 18 minutes water level in the tank risese by 4.5 m?

(a)10km/hr
(b)12km/hr
(c)8km/hr
(d)none of these If sohail walks from his home to office at 16km/hr.he is late by 5 min.If he walks at 20km/hr.he reaches 10 min before the office time. Find the distance of his office from his home?

(a)22km
(b)20km
(c)18km
(d)16km