If 6 ax -9 ax -5-1-4 x -89- find x- when a -2A- 15B- 20C- 30D- 10

The correct option is B 20 6ax 9ax/5+1=4x+89 ⇒ 6ax 9ax/5 4x5=89 1 ⇒30ax 9ax 20x/5=88 ⇒ 21ax 20x=5×88 ⇒ x(21a 20)=440 ⇒ x=440/21a 20 Given a=2 ∴ x=440/42 2 ...

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Quantitative Aptitude

A.M Greater than or Equal to G.M

If 6 ax -9 ax...

Question

$If 6 a x - \frac{9 a x}{5} + 1 = 4 x + 89, find x, when a = 2$

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Solution

The correct option is C
20

$6 a x - \frac{9 a x}{5} + 1 = 4 x + 89 \Rightarrow 6 a x - \frac{9 a x}{5} - 4 x 5 = 89 - 1 \Rightarrow \frac{30 a x - 9 a x - 20 x}{5} = 88 \Rightarrow 21 a x - 20 x = 5 \times 88 \Rightarrow x (21 a - 20) = 440 \Rightarrow x = \frac{440}{21 a - 20} Given a=2 ∴ x = \frac{440}{42 - 20} = \frac{440}{22} \Rightarrow x = 20$

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If 6ax−9ax5+1=4x+89,find x, when a = 2

The correct option is C 20 6ax−9ax5+1=4x+89⇒6ax−9ax5−4x5=89−1⇒30ax−9ax−20x5=88⇒21ax−20x=5×88⇒x(21a−20)=440⇒x=44021a−20Given a=2∴x=44042−20=44022⇒x=20

$If 6 a x - \frac{9 a x}{5} + 1 = 4 x + 89, find x, when a = 2$