the marks scored by a student in five subjects are 80, 75, 66, 51 and 91. how much should he scored in the 6th subject to make his average socre 75?
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75=80+75+66+51+91+x/6
6X75=363+x
450-363=x
x=87
6X75=363+x
450-363=x
x=87
rika1:
but its some what wrong the method is correct
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