How do you figure this out?

Science & Mathematics by Anonymous 2018-06-05 14:03:21

Social Science

7 answers

1/4 is the average (arithmetic mean) of 1/5 and what number?

Anonymous

(1/5 + x)/2 = 1/4 1/5 + x = 1/2 2/10 + x = 5/10 x = 3/10
Anonymous

Let x be the required number. (1/5 + x)/2 = 1/4 2(1/5 + x) = 1 x = 1/2 - 1/5 x = 3/10
Anonymous

(⅕+x)/2 = ¼ ⅕+x = ½ x = ½-⅕ = 3/10
Anonymous

since mean is sum of terms divided by number of terms, it'll be 1/4=(1/5+x)/2 multiply 2 on both side 1/2=1/5+x subtract 1/5 1/2-1/5=x LCD 5/10-2/10=x 3/10=x
Anonymous

1/4 = (1/5 + a) / 2 (1/4) * 2 = 1/5 + a 1/2 = 1/5 + a 1/2 - 1/5 = a 5/10 - 2/10 = a 3/10 = a
Anonymous

4
Anonymous

for two values: avg = (x + y) / 2 0.25 = (0.2 + y) / 2 0.5 = 0.2 + y y = 0.3 or 3/10