Question

plaese answer all section d questions

Answer 1

4.Let one of the number be x.Then other will be x+3,

We can write two number from them
10(x)+(x+3) and 10(x+3)+(x)

According to que,

10(x)+(x+3)+ 10(x+3)+(x)=99
10x+x+3+10x+30+x=99
22x+33=99
22x=99-33
22x=66
x=66/22
x=3

Hence,of the number=3
So,another will be 3+3=6

Thus, the required number=63 or36


5.Total distance=8km
taken to go down stream=40min=2/3hr

Speed of the sailer={8/(2/3)}km/hr
=(8×3/2)km/hr
=12km/hr


During returing
Total distance=8km
time taken=1hr

So,speed during returning=8km/hr


Hence speed of the curren=4km/hr