Price of 15 maths book is $825 and the price of 19 science book is $855. Jack buys 3 maths book and 2 science book, how much he has to pay?
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Answer:
1 maths book 825÷15=55
3 maths book 55×3=165
1 science book 855÷19=45
2 science book 45×2=90
so 165+90=255 your answer
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