In a test (+5) marks are given for every correct answer and (-2) marks are given for every incorrect answer . Roy answered all the questions and scored 30 marks though she got 10 correct? Find the total number of sums .
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Answered by
5
Answer:
Total number of sums are 20
Step-by-step explanation:
let the number of incorrect Answers be X
number of correct answer = 10
marks for every correct answer=+5
total marks she got for correct Answers= 5×10= 50
50+(-2)X=30
50 -2x=30
50- 30= 2x
20 = 2x
X= 20 /2
x=10
number of incorrect answer =10
Therefore, Total Number of sums in exam are 20
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Answered by
0
Answer:
Step-by-step explanation:
Total no of question answered =30 * 5=150
total no of correct answered =10*5=50
total no of incorrect answered =20*5=100
for every incorrect answered =20*-2= -40
so, +50 -40 =10
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