Question

please give me answer​

Answer 1

Answer:

84 answers correct

Step-by-step explanation:

Let us suppose the no. of correct answers is x and wrong answers be y

Then -

x + y = 120

and

5x - 2y = 348 according to the given two conditions

solving eq. 1

x = 120 - y

putting this value in eq. 2

5 (120-y) - 2y = 348

600 - 5y -2y = 348

-7y = 348 -600 = -252

y = -252 / -7 = 36

so, x = 120 - 36 = 84

so, he answered 84 correct and 36 wrong answers.

Answer 2

Answer:

Here is ur answer

Step-by-step explanation:

$marks \: given \: for \: \\ correct \: answers \: = \: 5$

$marks \: deduced \: \\ from \: the \: whole \: total \: if \: answer \: \\ is \: wrong \: = \: 2$

$total \: questions \: answered \: \\ by \: vidhya \: = \: 120$

$total \: marks \: in \: exam \: = \: 120 \times 5$

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: 600$

$marks \: secured \: by \: vidhya \: = \: 348$

$so \: to \: find \: the \: correct \\ \: answered \: questions \\ \: first \: we \: need \: to \: find \\ \: the \: incorrect \: answered \: ones \:$

$iqncorrect\: ones \: is \: x$

$so \: correct \: ones \: is \: 120 - x$

$so \: now \: 5x \: + 2(120 - x) = 348$

$5x + 240 - 2x = 348$l

$3x + 240 = 348$

$3x = 348 - 240$

$3x = 108$

$x = \frac{108}{3}$

$x = 36$

$therefore \: 36 \: questions \\ \: were \: answered \: \\ incorrectly \: by \: vidhya$

So the Correctly Answered questions by Vidhya is 120-36 = 84