Xiao Jun read a story book. He read two thirds of the book in seven days. In the next five days, he read 40 pages. How many pages does the book have

Xiao Jun read a story book. He read two thirds of the book in seven days. In the next five days, he read 40 pages. How many pages does the book have

40/（1-2/3）
=40/（1/3）
=40X3
=120 (page)
/Denotes divided by
How about x + 5 = 17
First, multiply 3 on both sides to get x + 5 = 51, so x = 46
I run 4.2km in the morning seven days a week
7s=4.2
s=0.6
Solve the equation 3x of 4 + 5% x = 17.6 4 of 3 / x = 5 of 6 (5 of 6 + 5 of 8) * x = 7 of 20
If you can calculate simply, you should calculate simply
12 * (2 / 3 + 1 / 6)
24 * 5 / 36-3 / 8
7 / 10 * 5 / 16 / 21 / 32
12 * (2 / 3 + 1 / 6) 24 * 5 / 36-3 / 8 7 / 16 5 / 32 21 / 10
=12 * 2 / 3 + 12 * 1 / 6 = 10 / 3-3 / 8 = 7 / 32 / 21
=8 + 2 = 71 / 24 = 1 / 3
=10
The one upstairs may not understand your division sign (/)
①12*2/3+12*1/6=8+2=10
②24*5/36-3/8=10/3-3/8=80/24-9/24=71/24
7 out of 10 * 5 out of 16 / 21 out of 32 questions are wrong, as if solving the equation 3x out of 4 + 5% x = 17.6 4 out of 3 / x = 5 out of 6 (5 out of 6 + 5 out of 8) * x = 7 out of 20 ① 3x / 4 + 0.05x = 17.6 multiply by 4x + 0.2x = 70.43.2x = 70.4x = 22 ② 3... Expand
①12*2/3+12*1/6=8+2=10
②24*5/36-3/8=10/3-3/8=80/24-9/24=71/24
7 out of 10 * 5 out of 16 / 21 out of 32 questions are wrong: solving equation 3x out of 4 + 5% x = 17.6, 4 out of 3 / x = 5 out of 6 (5 out of 6 + 5 out of 8) * x = 7 out of 20
Read a book, read two-thirds of the book in seven days, read 60 pages in the next five days, just finished. How many pages is the book?
60/（1-2/3）＝180
Solution equation: 17-140% x = 3
The solution is 17-5 / 7X = 3
7x = 17-3
7x of 5 = 14
x=10
17-140%x=3
17-3=1.4x
x=14/1.4
x=10
Hello!
17-140%x=3
140%x=17-3
x=10
If it helps you, please take it! I wish you a higher level of learning, mathematics counseling group to solve your problems!
17-140%x=3
140%x=17-3
140%x=14
x=14÷140%
x=10
Xiaojun has read 5 / 2 of a book, and the rest is ready to finish in 9 days. How many parts of the book do he read every day
（1-2/5）÷9=1/15
3x / 4 + 5% x = 17.6 4 / 3 △ x = 5 / 6 (5 / 6 + 5 / 8) ×
What can be calculated simply should be calculated simply: 5 / 24 × 36 - 3 / 8 × 16 5 / 32 21 / 32
Solving equation (important process): 3x + 5% x = 17.60.8x = 17.6x = 223 / 6 / 5 x = 4 / 3 / 5 / 6x = 8 / 5x = 1.6 (5 / 6 + 5 / 8) × x = 20 / 735 / 24x = 7 / 20x = 7 / 20 / 35 / 24x = 6 / 25
3x / 4 + 5% x = 17.6
0.75x+0.05x=17.6
0.8x=17.6
x=22
4 / 3 x = 5 / 6
5x/6=3/4
x=18/20
x=0.9
(5 / 6 + 5 / 8) × x = 7 / 20
(20+15)/24x=7/20
35x/24=7/20
x=6/25
... unfold
3x / 4 + 5% x = 17.6
0.75x+0.05x=17.6
0.8x=17.6
x=22
4 / 3 x = 5 / 6
5x/6=3/4
x=18/20
x=0.9
(5 / 6 + 5 / 8) × x = 7 / 20
(20+15)/24x=7/20
35x/24=7/20
x=6/25
24 × (5 / 36-3 / 8)
=10/3-9
=10/3-27/3
=-17/3
7 / 10 × 5 / 16 △ 21 / 32
=7/10×5/16×32/21
=1 / 3 "put away
Xiaojun's birthday, my mother bought a cake, cut 13 to Xiaojun, Xiaojun only ate 12 of them, Xiaojun ate how much of the whole cake?
13 × 12 = 16; a: Xiaojun ate 16% of the whole cake
X plus 3 / 5 equals 7 / 10 (solving the equation)
x=7/10-3/5
x=1/10