One number is 3 time another number. if 5 is added to both the number then one of the new number becomes twice that of other new number find the number?

The original number is 5.

Step-by-step explanation:

If one number is x then the other is 3x.

Adding 5 to both numbers we get x + 5 and 3x + 5 and we are also given that (3x + 5) = 2(x + 5)

3x + 5 = 2x + 10

3x - 2x = 10 - 5

x = 5.

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional