Question

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 .

Answer 1

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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Answer 2

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