1.

1). 4.82). 1.223). 1.64). 7.4

Answer»

We know that,

$(Average\ of\ some\ entities = {{SUM\ of\ the\ entities} \over {number\ of\ the\ entities}})$

Given, $({{p + q} \over 2} = 5.8)$ ⇒ p + q = 11.6 ……… (i)

Also, $({{q + R} \over 2} = 1.4)$ ⇒ q + r = 2.8……… (ii)

And, $({{r + s} \over 2} = 0.7 \Rightarrow)$ r + s = 1.4 …………….. (III)

From operation, [(i) – (ii) – (iii)] we GET,

⇒ p + q - q - r - r - s = 11.6 - 2.8 - 1.4

⇒p – 2r - s = 7.4



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