The answer to this is 10 and 5
The number 16.6666667 rounded to the nearest tenth is 16.7. Rounding is done by looking at the number to the right of the digit you're rounding to; if it's 5 or more, you round up.
The student is asking about rounding the number 16.6666667 to the nearest tenth. Rounding is used to make a number easier to work with. In this case, we will be rounding to the tenth place, which is one decimal place to the right of the decimal point.
The number in the tenth place here is 6. The number to its right is also 6. When the number to the right of the digit you are rounding to is 5 or more, you round up. Therefore, 16.6666667 rounded to the nearest tenth is 16.7.
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It these triangles are similar, then the sides of the triangles are in proportion:
cross multiply
use distributive property
subtract 10y from both sides
divide both sides by 5
cross multiply
divide both sides by 8