Subject
Quantitative Aptitude
Topic
Average
If the average (arithmetic mean) of x and y is 60 and the average (arithmetic mean) of y and z is 80, what is the value of (z-x)?
If the average (arithmetic mean) of x and y is 60 and the average (arithmetic mean) of y and z is 80, what is the value of (z-x)?
ক)
70খ)
40গ)
20ঘ)
noneExplanation
প্রশ্নে বলা হচ্ছে, x ও y এর গড় হলো ৬০ এবং y ও z এর গড় ৮০ হলে (z - x) ? x ও y এর গড় মান =x + y/2 = 60 হলে x + y=60 x 2 = 120 .......... (i) এবং, y + z=80 x 2 = 160 .................(ii) সমীকরণ (i) – (ii) নং হতে পাই, x + y - y - z = 120 - 160 ⇒ x - 2 = -40 ⇒ z - x = 40 [-1 দ্বারা গুণ করে ] ∴ z - x = 40Related questions
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