a sum of rupees 500 is in the form of denomination of rupees 5 and rupees 10 is the total number of notes is 90 find the number of notes of each denomination
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Let the number of 5 notes be = x
Total no. of notes is =90
Hence the number of rs. 10 note be (90-x)
Total sum of money = rs. 500
.
. . 5x +10 (90-x)=500
➡️ 5x+900-10x=500
➡️ 5x = 500-900
➡️ 5x= -400
➡️ x= -400÷-5 = 80
Hence there are 80 notes of rs. 5
Number of rs. 10 notes =90-80==10
Hence there are 10 notes of rs. 10.
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