Delhi

Kriti Goel replied | 1 day ago

Let the ages of P and Q be 5x and 7x respectively. Q's present age= 7x P's age after 6 years= 5x+6 Given that: (7x) - (5x+6) = 2 ...........(1) Solving equation (1), we get: 2x-6 = 2 2x = 8 x = 4 Hence, P's present age = 5x = 5*4 = 20 Q's present age = 7x = 7*4 = 28 Hence, total of P's and Q's present age = 20+28 =48 years

Manisha Singh replied | 2 hrs ago

Let's assume P and Q's present ages are pp and qq

So p:q=5:7p:q=5:7 ie p/q=5/7p/q=5/7 ie p=5/7×qp=5/7×q

As per second statement

q−(p+6)=2q−(p+6)=2

{Replace p's value from eqn 1 into eqn 2}

q−(5/7×q+6)=2q−(5/7×q+6)=2

ie 2/7×q=82/7×q=8

ie q=8×7/2=28q=8×7/2=28

So p=20p=20

So total of their present age is 48.

Jagarlamudi Siva Lokesh replied | 5 hrs ago

every mode of teaching as it pros and cons 

online is convient , safer method of teaching but teacher dont have physical acess to his notes and test copies and teacher did not have much control in online mode

physical class is best for students who are below 8 th standard as they required personal monitering of how they understanding the teachings 

Amit Pandey replied | 2 hrs ago

It is depends on the student who want to online classes or want to offline classses generally if face to face is traditional way of teaching advantage is that you can ask your doubt with getting any disturbance with punctually which generally happens during taking onlilne classes also teacher also focus you proparly  upon you and you also be alert in this way of class.

But online mode is new and demanding mode of taking classes bcs by this way you can high qualified teachers easily . you are not dependent on one teacher you can select as your need . you can get demo from many teachers with easily . your choice of selection is also  more. 

Isha Agarwal replied | 2 days ago

According to me your first task is to clear your concepts from where formulae are evaluated. Secondly you should do a number of numerical. That will definitely helps you to remember all formulae.

Ankit Gupta replied | 10 hrs ago

 Write all formulas in a paper and relate to each other and much practice on every formula then you can easily learn.