Question

the sum of three and twice the number xis 40​

Answer 1

Step-by-step explanation:

here's what we know:

x + y + z = 40

x = y + 5

x = 2z

We can rewrite the variable information so that we can replace those with x instead:

x - 5 = y

x/2 = z

Now that we have isolated the variables, we can put them into the equation:

x + x - 5 + .5x = 40 (.5 = 1/2)

2.5x - 5 = 40

2.5x = 45

x = 18

Now that we know x, we can solve for the other variables:

y = 18 - 5

y = 13

z = 18/2

z = 9

Now to check:

18 + 13 + 9 = 40

18 + 22 = 40

40 = 40

Answer 2

Answer:

let the no. be x

three times of no. = 3x

twice of the number= 2x

A. T. Q

3x+ 2x= 40

5x= 40

x = 40/5

x= 8

hence the no. = 8