Xiaolan read a book. On the first day, she read one sixth of the whole book. On the second day, it seems that one fifth of the whole book is exactly 60 pages. How many pages did she read on the first day?,

Xiaolan read a book. On the first day, she read one sixth of the whole book. On the second day, it seems that one fifth of the whole book is exactly 60 pages. How many pages did she read on the first day?,

If one fifth of the whole book is 60 pages the next day, the book has a total of 5x60 = 300 pages. Because one sixth of the whole book is read on the first day, 300x1 / 6 = 50 pages are read on the first day

Xiaolan read a book. On the first day, she read 1 / 6 of the whole book; on the second day, she read 1 / 5 of the whole book, which is exactly 60 pages. How many pages did she read on the first day?

60 divided by 1 / 5 = 300 pages 300 × 1 / 6 = 50 pages

Xiaolan read a book. On the first day, she read 1 / 6 of the whole book, and on the second day, she read 1 / 5 of the whole book. In two days, she saw 60 pages. How many pages is the book?
Don't say 300 pages

Is the title wrong? If it can't be calculated according to the title, then 1 / 6 * x + 1 / 5 * x = 60
If you read 1 / 6 of the whole book on the first day and the remaining 1 / 5 on the second day, it's 180
You see, it should be right

If the circumference of a circle is tripled, the area will be enlarged______ Times

The circumference of a circle is in direct proportion to its radius: if the circumference of the circle is increased by three times, the radius of the circle is increased by three times; if the area of the circle is in direct proportion to the square of the radius of the circle, if the radius is increased by three times, the area of the circle is increased by three times. 32 = 9, so the circumference of the circle is increased by three times, and the area of the circle is increased by nine times

In quadrilateral ABCD, ∠ a = C, ∠ B = D, is quadrilateral ABCD a parallelogram? Why?

A quadrilateral ABCD is a parallelogram
Because ∠ a = C, ∠ B = D
∠A+∠C+∠B+∠D = 360
Then ∠ a + B = 180 = = > AD / / BC
∠A+∠D = 180 ==>AB//CD
So the quadrilateral ABCD is a parallelogram

It is known that in the cubic polynomial of a, the constant term is - 1, the coefficient of the first term is 2, the coefficient of the second term is 0, and the coefficient of the third term is 5

5a³+2a-1

(as shown in the figure) connect a cylinder with height of 3 in a cone with bottom radius of 2 and generatrix length of 4, and calculate the surface area of the cylinder

Let R be the base radius of a cone, R be the base radius of a cylinder, and s be the surface area, then r = 1 & nbsp; (2 points) ‖ s base = 2 π, s side = 23 π, s = (2 + 23) π. (6 points)

In the equal ratio sequence {an}, the first n terms and Sn = 3N + A, then the general term formula is______ ．

∵ Sn = 3N + A, ∵ A1 = S1 = 3 + A, ∵ an = sn-sn-1 = (3N + a) - (3n-1 + a) = 2 × 3n-1, ∵ A1 = 2. Also ∵ A1 = S1 = 3 + A, ∵ 3 + a = 2,