ByjusClasses wrote:

Prompt analysis

a,b,c,d are the numbers such that a<b<c<d and (a+b+c+d)/4 = 50 and (b+c)/2 = 50 therefore a+d = 100

Super set

the answer will be a positive real number

translation

In order to find the answer, we need

1# exact value of all a

2# another equation in a and d

3# any specific property of a the restrict the valuye

statement analysis

St 1: range is 100. or d-a =100. therefore d =100 and a =0. ANSWER

St 2: a+d =100. that is already inferred from the question statement. INSUFFICIENT

Option A

coolnuts wrote:

The range is 50. So as per the Q S1 should be d-a=50 and not 100 as stated by you.

Dear

ByjusClasses,

My colleague, a good solution. I simply want to point out, as

coolnuts pointed out, that the range is 50. Of course, this doesn't change the answer to the DS question, but it would if similar information were in a PS question.

In fact,

d - a = 50 and

a + d = 100, so

d = 75 and

a = 25.

Also,

coolnuts, the "report a problem" feature is really to indicate, for example, that a problem has a typo or has been miscopied from its source. Reporting a problem requires an expert to address it. If you see a problem in what another user has written, respond and tell that user yourself. Initiative and responsibility are important qualities when you are a manager, so it's good to practice them now.

Does all this make sense?

Mike

_________________

Mike McGarry

Magoosh Test Prep

Education is not the filling of a pail, but the lighting of a fire. — William Butler Yeats (1865 – 1939)