Let's call 'it' x. 1/2 is equal to one third of x, so we could say that 1/3x = 1/2
Now we just have a simple equation to solve:
1/3x = 1/2
x = (1/2) / (1/3)
Dividing by a rational number (such as 1/3, which is expressed in fraction form) is the same as multiplying by its reciprocal (the reciprocal of a fraction is itself when the numerator and denominator have been swapped). Therefore
x = (1/2) / (1/3) = (1/2) * 3 = 3/2 = 1.5
To check this answer, test the statement. Half is a third of x, where x=1.5:
1.5 / 3 = 0.5 = 1/2
5/8 + 3/10
Multiple both 8 and 5 by 5
Multiple both 10 and 3 by 4
25/40 + 12/40 = 37/40
Step-by-step explanation:
a) the mean is all the numbers added together and then divided by the total number of students (19)
b) add up all of the numbers apart from 120 and divide by 18
tbh I'm not sure about what this illustrates sorry
I think x=90°, and z=136°