Question

14% of 80 + ?% of 90 = 31.9
(1) 16
(2) 23
(3) 18
(4) 26
(5) None of these

Answer 1

Good morning mate.....

Option 2 ( 23) is correct answer...

See here for solution.....

(14%of 80) + ( ?% of 90)= 31.9
11.2 + ? % of 90= 31.9
? % of 90= 20.7
thus... ? = ( 20.7 * 100 ) / 90= 23....

Hope it helps u......

Answer 2

Option (2) is the answer....

Given

(14% of 80 ) + (?% of 90) = 31.9

Let ? be x%

so we can write it as..

(14% of 80 ) + (x% of 90) = 31.9

(80×14/100 )+( 90×x/100 )= 31.9

11.2 + 0.9x = 31.9

0.9x = 31.9 - 11.2

0.9x = 20.7

x = 20.7/0.9

x = 23...

So (14% of 80 ) + (23% of 90) = 31.9..