Kate is three years older than her sister. In two years Kate will be twice older. How old is Kate's sister now?

Kate's sister is 5

Step-by-step explanation:

(k = kate's age)

(s = sister's age)

k = s + 3

k + 2 = 2s

Rearrange k + 2 = 2s into and plug it into the first equation

k = 2s - 2

2s - 2 = s + 3

2s - s = 3 + 2

s = 5

the correct answer is 45x

9×5=45 then add the x

walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40