72-3- 494-7- 633-4- 815-85-63 -

The correct option is A 15.1Here, 7^2.3× 7^2 × 4.7× (7 × 9)^3.4× (9^2)^5.85 = 63^? ⇒ 7^2.3 + 9.4 + 3.4× 9^3.4 + 11.70 = (63) ? ⇒ 7^1.51× 9^15.1 = (63)^? ⇒ (63) ...

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72.3× 494.7× ...

Question

$7^{2.3} \times 49^{4.7} \times 63^{3.4} \times 81^{5.85} = 63^{?}$

16.25

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15.1

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13.4

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18.9

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Solution

The correct option is B 15.1
Here,
$7^{2.3} \times 7^{2 \times 4.7} \times (7 \times 9)^{3.4} \times (9^{2})^{5.85} = 63^{?} \Rightarrow 7^{2.3 + 9.4 + 3.4} \times 9^{3.4 + 11.70} = (63) ? \Rightarrow 7^{1.51} \times 9^{15.1} = (63)^{?} \Rightarrow (63)^{15.1} = (63)^{?} \Rightarrow ? = 15.1$

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72.3×494.7×633.4×815.85=63?

The correct option is B 15.1Here, 72.3×72×4.7×(7×9)3.4×(92)5.85=63?⇒72.3+9.4+3.4×93.4+11.70=(63)?⇒71.51×915.1=(63)?⇒(63)15.1=(63)?⇒?=15.1

$7^{2.3} \times 49^{4.7} \times 63^{3.4} \times 81^{5.85} = 63^{?}$

The correct option is B 15.1
Here,
$7^{2.3} \times 7^{2 \times 4.7} \times (7 \times 9)^{3.4} \times (9^{2})^{5.85} = 63^{?} \Rightarrow 7^{2.3 + 9.4 + 3.4} \times 9^{3.4 + 11.70} = (63) ? \Rightarrow 7^{1.51} \times 9^{15.1} = (63)^{?} \Rightarrow (63)^{15.1} = (63)^{?} \Rightarrow ? = 15.1$