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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The sum of 7 times a number and 7 divided by 2 is 14? Ray started driving to the mall at 30 mph. A short while later he realized he forgot his wallet. He turned around & headed back to the house at 20 mph. It took him a total of .6 ho