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Suppose n is an integer such that the sum of digits of n is 2 and 10^10

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From each of the two given numbers,half of the smaller number is subtracted. of the resulting numbers,the largest is three times the smaller one.what is the ratio of the two numbers?
(a)5:4(b)5:2(c)3:2(d)2;1(e)7:4 A car is travelling at uniform speed.the driver sees a milestone showing a two digit number which is a perfect square,after travelling for an hour the driver sees another milestone with the same digits in reverse order and after another hour the driver sees another milestone containing the same two digits as part of a three digit number.what is the speed of the car?
(a)30kmph(b)40kmph(c)50kmph(d)60kmph(e)45kmph