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Answer to: The students in three classes are in the ratio 4 : 6 : 9. If 12 students are increased in each class, the ratio changes to 7 : 9 : 12. Then the total number of students in the 2nd Class before the increase is

The Initial ratio is 4 : 6 : 9

Let the common ratio be ‘x’

Therefore...

Answer to: What is the maximum number of IP addresses that can be assigned to hosts on a local subnet that uses the 255.255.255.224 subnet mask?

A network administrator is building a network for a small business that has 22 hosts. The ISP has...

Answer to: The quantity of water required per 50 kg of cement for nominal mix concrete for M20 is:

Water content is an important parameter deciding the strength.

A nominal mix is desi...

Answer to:  After working for 6 days, Ashok finds that only 1/3 rd of the work has been done. He employs Ravi who is 60% as efficient as Ashok. How many days more would Ravi take to complete the work?

Answer to: The total number of students in a school was 660. The ratio between boys and girls was 13:9. After some days, 30 girls joined the school and some boys left the school and new ratio between boys and girls became 6: 5. The number of boys who left the school

In the first case,

boys = $\frac{13}{22}\times660$=390

girls = $\fra...