Question

23. If the cost of 20 books is 180,
how much will 15 books cost?​

Answer 1

Answer:

Cost of 1 book = 20/180

ans --9

cost of 15 books =9*15

ans 135

Answer 2

Step-by-step explanation:

books. cost

20. 180

15. x

let's cross multiply each other.......

Then...(20Xx) and 180X15

Taking this....

180X15 is equal to 2700....

so....20Xx is equal to 20x.....

here comes.....2700 divided by 20x

here.....0 and 0 are cutted...

2 divided by 270... is 135....

15 books will cost 135......

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