Answer:
5x
Step-by-step explanation:
5/11 is a fraction, so it is for sure a rational number and a real number.
Since it is a fraction, it is NOT irrational (which means "not rational" or "not a fraction).
It is NOT an integer, whole number, or natural number, becuase it is only a piece of a whole. 5/11 ≈ 0.454545..., and intergers, whole numbers, and natural numbers don't involve decimals.

so.. .whatever those amounts are, of "x" and "y", for the mixture,
they must add up to 100 grams, or x + y = 100
and the titanium percentage of that sum, must yield a 13 grams of titanium on those 100 grams
thus

do the substitution, and solve for "x",
what's "y" amount? well, y = 100 - x
Answer: =
60
x
y
+
290
x
−
102
y
−
493
8
x
+
1
Step-by-step explanation:
10
x
−
17
)
(
6
y
+
29
)
8
x
+
1
A human blinks 6,250,000 times a year.
A seal blinks 1,010 times a year.