Question

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 1

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