Powers and Roots Practice Test 2

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Question : 35 of 40

Marks: +1, -0

If 30% of

√{?}

+ 15% of 40 = 11, what should replace the sign of interrogation (?)?

$2500/ 9$
$2400 /7$
$2300 /11$
$2200 /7$

Solution:

30% of

√{?}

+ 15% of 40 = 11

∴30/100×√{?}+15/100×40=11

⇒30√{?}+600=1100

⇒?=(500/30)^2=2500/9

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