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3 years ago

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There is only one positive integer which is exactly twice the sum of its digits. find this 2 digit number

1 answer:

ad-work [718]3 years ago

8 0

There is only one positive integer which is exactly twice the sum of its digits. find this 2 digit number

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3 years ago

If two mammoths take seven hours to walk eleven kilometres, how long would it take five mammoths to walk twenty two kilometres a

kati45 [8]

This is a funny one. teachers do this to try to confuse you with the numbers. first you need to find out what is important in the question.

2 mammoths, 7 hours, 11 kilometers.
&
5 mammoths, ? hours, 22kilometers.

the amount of mammoths do not matter, because each walk the same speed.

so you only need to look at this.

7 hours to go 11 kilometers
&
? hours to go 22 kilometers

fast answer is. it's twice the distance so it will take twice as long. 14 hours.

solve answer.

7×60min = 420min
420min ÷ 11 kilometers = 38.18181818min per 1 kilometer.

38.18181818 • 22 = 839.999999min round up 840.

840min ÷ 60min = 14 hours

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3 years ago