13. A sum of 800 is in the form of denominations of 10 and 20. If the total number of
notes is 50, find the number of notes of each type.
plz tell me that how thousand came in this question...
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Step-by-step explanation:
Let there be X notes of Rs 10.
Total number of notes = 50.
∴ Number of notes of Rs 20 = (50 – x)
Total sum of money = Rs 800
∴ 10x+ 20 (50 – x) = 800
⇒ 10x+ 1000 – 20x = 800
⇒– 10x = 800 – 1000
⇒ – 10x= – 200
⇒x= 20
∴ 50 – x = 50 – 20= 30
So, there are 20 notes of Rs 10 and 30 notes of Rs 20.
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