Arithmetic - the 4 subjects marks in the ratio 6:7:8:9 and average=60 how many subjects more than 50 did he score

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the 4 subjects marks in the ratio 6:7:8:9 and average=60 how many subjects more than 50 did he score.

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Total Answers and Comments: 3

Last Update: May 07, 2008 Asked by: div

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Submitted by: Divya Sanam

(6x+7x+8x+9x)\4=60 ther fore x=8 Ans 3 subjects 7*8,8*8,9*8>50 and 6*8<50

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sandy.sagi

January 27, 2006 14:09:13

Divya Sanam

RE: the 4 subjects marks in the ratio 6:7:8:9 and aver...

(6x+7x+8x+9x)\4 60 ther fore x 8 Ans 3 subjects 7*8 8*8 9*8>50 and 6*8<50

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October 24, 2006 19:06:27

sami

RE: the 4 subjects marks in the ratio 6:7:8:9 and aver...

how you get x 8 when x 1 you subtract 6x from 7x which equals 1x the u put 4 1x+3 then subtract 3 from both sides which equals 1 so x 1

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May 07, 2008 12:20:13

Sanjibic

Member Since: May 2008 Contribution: 7

RE: the 4 subjects marks in the ratio 6:7:8:9 and average=60 how many subjects more than 50 did he score.g

Sum --> 6+7+8+9 30
Average weight 30/4 7.5

OR 7.5 60
SO 30 (60/7.5)30
240 (Total Score)

So single weight carries 240/30 8 marks

So 6 weights 48 Marks
7 weights 56 Marks
8 weights 64 Marks
9 weights 72 Marks
________
Total 240 Marks

So more than 50 3 subjects.

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