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A bill for Rs 40 is paid by means of Rs 5 notes and Rs 10 notes. Seven notes are used in all. If x is the number of Rs 5 notes and y is the number of Rs 10 notes, then (a) x + y = 7 and x + 2y = 40 (b) x + y = 7 and x + 2y = 8 (c) x + y = 7 and 2x + y = 8 (d) x + y = 7 and 2x + y = 40 |
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Answer» (b) x + y = 7 and x + 2y = 8 Total number of notes = 7 \(\Rightarrow\)x + y = 7 Total value of notes = Rs 40 \(\Rightarrow\)5x + 10y = 40 \(\Rightarrow\)x + 2y = 8 |
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