Question

in a test + 5 marks are given for every correct answer (-2 ) marks are given for or every incorrect answer . Radhika answered all questions and scored 30 marks though she got 10 correct answers .how many incorrect answer she attempt step by step ​

Answer 1

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Answer 2

$\tex\bigstar\:\sf{ANSWER}\:\bigstar$

$\tex\implies\sf{ Total\:marks\:Radhika\:scored \: in \: the\: exams \:= \: 30}$

$\tex\implies\sf{Marks\: given\: for\: every\: correct\: answer\:=\: +5}$

$\tex\implies\sf{Marks\:reduced\:when\:the\:answer \:is\:wrong\:=\:-2}$

$\tex\implies\sf{No.\: of \: total\: correct\: answers\: she\: got\:=\: 10}$

$\tex\sf{ According\:to\:this\:given\:condition,}$

$\tex\implies\sf{ Marks\:she\:want\:to\:get\:=\:10\:x\:5\:=50}$

$\tex\implies\sf{But\: she\: actually\: got\:=30}$

$\tex\implies\sf{Incorrect\:answers \: she \: attempted\:=\frac{20}{2}$

$\tex\implies\sf{The\:total\:number\:of\:incorrect\:answers \:= 10}$

$\tex\huge\boxed{The\:answer\:is\: 10}$