Find two consecutive natural numbers whose sum is 53

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Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?

The sum of these consecutive integers is equal to 9 less than 4 times the least of the integer. find the three integers

The distance of a chord from the centre of a circle is 12cm and the lenght of the chord is 10cm. find the radius of the circle