She used 2.67 ounces of ice cream in the shake. (2/3) * 4 = 8/3 which is equal to approximately 2.67 ounces.
I don't know if u can see it, but there.
X=12
Y=15
Z=20
Unknown = x
the quotient of x and 12 is x/12 than 49 more than that is 53,
(x/12)+49=53, now use basic math and solve
-49 from both side,
x/12=4
*12 to both side,
x=48
therefore the unknown number is 48
