Question

b) A book and a copy cost Rs 60 and Rs 45 respectively. Find the smalles sum of money with which exact number of books and copies can be purchased.
c) On the occasion of Tihar, Deepshikha uses the decorative lights at her house. The red light flickers in every 4 seconds and blue light flickers in every 6 seconds. If she switches on the lights together, after what time will both coloured lights flicker together again?
9. a) Two bells rings at the intervals of 30 and 40 minutes respectively. Find the least time interval after which they ring at a time. If they ring at 9:00 a. m. at once, at what time will they ring together again?
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Answer 1

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b) A book and a copy cost Rs 60 and Rs 45 respectively. Find the smalles sum of money with which exact number of books and copies can be purchased.

Answer : Rs. 180

c) On the occasion of Tihar, Deepshikha uses the decorative lights at her house. The red light flickers in every 4 seconds and blue light flickers in every 6 seconds. If she switches on the lights together, after what time will both coloured lights flicker together again?

Answer : ?

9. a) Two bells rings at the intervals of 30 and 40 minutes respectively. Find the least time interval after which they ring at a time. If they ring at 9:00 a. m. at once, at what time will they ring together again?

Answer : 12 minutes

Answer 2

Answer:

9 a 12 minutes is the correct answer pls mark me as brainlist pls ❤️