51. A number is larger than half of 100. It
is more than 6 tens and less than 8
tens digit is the double of the ones
tens. The sum of its digits is 9. The tens digit is the double of the ones digit what is the number
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50 + 6 -8 =2(2x+9)
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A number is larger than half of 100
Half of 100 is 50, Our number is greater than 50. Numbers which are greater than 50 are 51, 52, 53, and so on!
It is more than 6 tens and less than 8 tens
Numbers which are greater than 60 (6 tens) and less than 80 (8 tens) are 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79
The sum of it digits is 9
From the numbers which are given above, identify the numbers where the sum of two digits of a number is 9. Such numbers are : 63, 72
The ten digits is the double of the one digit
We have 63 and 72. Since the conditions says that The ten digits is the double of the one digit, 63 best suits the condition
Hence 63 is the Required Number
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