Question

What is the mathematical equation of twice a number is 6?

Answer 1

let the number is x
2*x=6

Answer 2

do you have another answer?

Answer 3

twice a number is 6

twice a number means the same thing as
two times a number is 6
change two to 2
2 times a number is 6
change "a number" to a *variable name* People use "x" for the "an unknown number"

2 times x is 6
change "times" to a multiply sign
2 * x is 6

"is" almost always changes to an equal sign =

2 * x = 6

which is the equation you want.
In algebra, we don't bother to write the multiply sign, so we could also write
2x = 6

Answer 4

ok thankyou

Answer 5

is it right that twenty-five decreased by twice a number is twelve the answer is 25-2x=12? or it is wrong?

Answer 6

twenty-five decreased by twice a number is twelve

to figure out what "decreased by" means I try a simple problem
2 decreased by 1 gives 1 or
3 decreased by 1 gives 2
so it must mean subtraction.

now to interpret:
twenty-five decreased by twice a number is twelve
25 - 2 * x = 12
or
25 -2x=12

yes you have the correct answer.

Answer 7

ok thankyou !