21)Deveshi has a total of Rs 590 as currency notes in the denominations of Rs 50, Rs 20 and Rs 10. The ratio of the number of Rs 50 notes and Rs 20 notes is 3:5. If she has a total of 25 notes, how many notes of each denomination she has?(PISA based question) *
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Answer:
Step-by-step explanation:
Given:
Deveshi has a total of Rs 590
50 notes and Rs 20 notes is 3:5
total 25notes
50/- = 3x
20/- = 5x
10/- = 25-(3x+5x)
= 25-8x
amount of 50/- = 50*3x = 150x
20/- = 20*5x = 100x
10/- = 10(25-8x) = 250-80x
150x+100x+250-80x = 590 (total amount)
170x+250 = 590
170x = 590-240
170x = 340
x = 2
50*3(2) = 300
20*5(2) = 200
250-[80(2)] = 90
denomination:
50/- = 6
20/- = 10
10/- = 9
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