The cost of four dozen proof machine ribbons and five dozen
accouting machine ribbons was Rs.160/-. If one dozen
accounting machine ribbons cost Rs.20/-, what is the cost of
a dozen proof machine ribbons?

Answers were Sorted based on User's Feedback



The cost of four dozen proof machine ribbons and five dozen accouting machine ribbons was Rs.160/-...

Answer / anitha bharathan

Given:
4( dozen Proof machine)+5(dozen Accounting machine)=160
Also 1 dozen Accounting machine=20
Therefore,
4( dozen Proof machine)+5(20)=160
4( dozen Proof machine)=160-100
4( dozen Proof machine)=60

dozen Proof machine=60/40
dozen Proof machine=15

Is This Answer Correct ?    40 Yes 1 No

The cost of four dozen proof machine ribbons and five dozen accouting machine ribbons was Rs.160/-...

Answer / guest

15

Is This Answer Correct ?    14 Yes 1 No

The cost of four dozen proof machine ribbons and five dozen accouting machine ribbons was Rs.160/-...

Answer / karthick.m

5 dozen *20 =100
so160-100=60
60 /4 = 15 per dozen

Is This Answer Correct ?    10 Yes 0 No

The cost of four dozen proof machine ribbons and five dozen accouting machine ribbons was Rs.160/-...

Answer / rbarunkumar

4x+5y=160
4x+5(20)=160
4x=160-100
x=60/4
x=15.

Is This Answer Correct ?    9 Yes 0 No

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