book Maths Puzzle Numerical Ability

what is the direct variation if y=5 when x=10 find y when x=1

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book Other Question

During a sale,the price of a book is reduced by 25%. The sale price is then further reduced by 40%. The cost of the book as a percentage of the original price is? seven times a number is the same as 12 more than 3 times the number. Find the number. we have to write an equation plus solve it.