Question

A student scored 65 marks in I language, 50 marks in Science, 55 marks in Social Science and some marks in Mathematics. If the average marks scored by him in all the four subjects is 60, then the marks scored by him in Mathematics is A 65 B. 60 C. 50 D. 70​

Answer 1

total number of tests = 4

lets assume that he got x marks in math

so ,(65+55+50+x)/4 = 60

=> 170+x = 240

=> x= 70

so he scored 70 marks in math

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Answer 2

Answer:

suppose he scores marks x in maths.

now we have,

marks in I language= 65

marks in Science= 50

marks in ssc= 55

then,.

Average marks=

sum of the total marks in the subjects/ total no. of subjects

so,. 60= 65+50+55+x/4

60= 170+x/4

170+x=60×4

170+x= 240

x= 240-170

so, x= 70

Hence marks in maths = 70