Respuesta :
Answer:
21 (Verified Answer) ✅
Step-by-step explanation:
A proportion is solved by cross multiplying.
3x = 21
x = 7
Now, let's check it
3(7) = 21 x 1
21 = 21 ✅
Answer:
x=7
Step-by-step explanation:
CROSS MULTIPLY
x/21=1/3
3*x=3x
21*1=21
3x=21
x=7