Question

If x =3 then y=21 what is the value of x when y=105

Answer 1

Answer: x = 15

Step-by-step explanation: Proportions.

• 3/21 = x/105 (cross multiply)
• 105*3 = 21x (simplify)
• 315 = 21x (divide)
• 15 = x

Answer 2

15

Explanation:

21/3=7

x=y/7

so 105/7=x

the answer is 105/7=15