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The sum of the two digits of a 2-digit number is 9. If 45 is subtracted from the number, the result will be expressed by the digits in reverse order. Find the number.

The number 50 is divided by a certain number. If the divisor is increased by 3, the quotient decreases by 3.75. What is the number?

There is a circle from within which a square is cut, the remaining portion having an area of 47.6255 square units.

Two officers each have a company of men, the one has 40 less than the other.

Image of first arithmetic book published in the English colonies in what is now the Eastern United States

An old Chinese general led his army to a river with a steep bank. Standing atop the bank, he held a stick 6 feet long perpendicular to himself.

A new sourcebook containing the works in their original form along with a translation and a brief commentary.

Now there are six-headed four-legged animals and four-headed two-legged birds. Find the total number of animals and birds.

A number is required; that the square shall be equal to twice the cube.

A ladder has 100 steps. On the first step sits 1 pigeon; on the second, 2; on the third, 3; and so on up to the hundredth. How many pigeons in all?

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