Question

in a mathematics paper there are 10 problems each correct answer carries 5 marks where as for each incorrect answer 2 marks are deducted from the marks scored Abdul answered all the questions but got only 29 marks find the number of correct answers given by Abdul​

Answer 1

Answer:

7

Step-by-step explanation:

given,

the number of problems in the mathematics paper are 10

each correct answer carries  5 marks

then,the total number of marks can be obtained are 50

for each incorrect answer 2 marks are  deducted

from this we can conclude that number of marks=5×x-2×y

(x=no. of correct answers and y=no. of wrong answers)

abdul got 29 marks,he attempted all the questions

so,x+y=10  ....(1) and 5x-2y=29  ....(2)

by solving 1 and 2

$________$             5x+5y=50

            5x-2y=29

                  7y=21

                    y=3

we know that x+y=10

                      x+3=10

                          x=10-3

                          x=7

∴the number of correct answers given by abdul are 7

hope it helps you