Math
posted by Harry on .
The secret number has a 7 in the ones place, The tens number is an odd number

You need more information to find this number.

Chart 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90

What do you think?
http://www.enchantedlearning.com/math/decimals/placevalue/ 
87