Judgment: Li Hong spent 1.5 yuan on three exercise books, and 2.5 yuan on Li Hua's five exercise books. The amount of money for buying exercise books can form a proportion ()

1.5:2.5=3:5

Li Hua wants to buy a bunch of flowers for her mother. If she buys four carnations, she still has 3.6 yuan left. If she buys eight of the same flowers, it's just 4.8 yuan short. How much does Li Hua bring

4X+3.6=8X-4.8
4X-8X=-4.8-3.6
-4X=-8.4
X=2.1
4x2.1 + 3.6 = 12 (yuan)
A:__________ .

Ask C ා programming process to change a 100 yuan note into 1 yuan, 2 yuan, 5 yuan change (requires 1 yuan, 2 yuan, 5 yuan change at the same time) To change a 100 yuan note into one yuan, two yuan and five yuan change (one yuan, two yuan and five yuan change is required), 50 pieces should be changed exactly. There are several ways to change in programming calculation. It is required to output the details and total number of each change method. C ා programming process

Console.WriteLine For (int b = 2; B < = 100; B + = 2) {for (int c = 5; C < = 100; C + = 5) {if (a + B + C = = 100) {int A1 = A / 1; int B1 = B / 2

Zhang Hua has two stamps of 0.8 yuan, 1.2 yuan and 2 yuan each. How many different postage can be paid? Wang Ling and Wang Ling have three stamps of 0.8 yuan, 1.2 yuan and 2 yuan each. How many different postage can be paid?

2, 2.8, 3.2, 4, 1.6, 2.4, 2.8, 3.2, 4, 1.6, 2.4, 2.4, 2.8, 3.6, 3.2, 3.2, 4.4, 4.8, 5.2, 4, 4.4, 4.8, 5.2, 4, 5.2, 6, 6, 6.4, 4.8, 5.2, 6 for 5, 7.2, 6.8, 6 for six for six, 8, so there are 0.8, 1.2, 2, 2, 8, 3.2, 4, 1.6, 2, 4, 1.6, 2, 4, 3.6, 4, 4, 4, 4, 5.6, 6, 6, 6, 6, 4, 4, 4, 4, 8, 8, 5.2,6,7.2,6.8,8 these species

Two and five cents

5 corners, 2 corners, 1 corner
It's OK to pay too much. She (he) will find it for you

Zhang Hua has 60 denominations of 10 yuan notes, 5 yuan notes and 2 yuan notes, with a total value of 350 yuan, of which the total value of 5 yuan notes and 2 yuan notes is 130 yuan

10 yuan (350-130) × 10 = 220 ／ 10 = 22 pieces
Let X of 5 be 60-22-x of 2 = 38-x
5x+2(38-x)=130
5x+76-2x=130
5x-2x=130-76
3x=54
x=18
A: 20 for 2 yuan, 18 for 5 yuan and 22 for 10 yuan

My mother brought me 10 yuan to buy Stationery. It cost 1 / 4 of the total for ink and 3 / 20 for pencil. How much money do I have left?

A quarter of the total cost of ink is 2.5 yuan for ink
3 / 20 of the total cost of the pencil is 1.5 yuan
So there's six yuan left

Xiao Ming took 10 yuan to buy Stationery. It took 1 / 4 of the total money to buy chalk and 3 / 20 to buy pencil. How much money does Xiao Ming have left?

10×（1-4/1-20/3）=6

Xiao Liang went to the store to buy Stationery. If he bought all the notebooks, he could buy 10 notebooks. If he bought all the pencils, he could buy 15. Now he bought 4 notebooks. How many pencils can he buy with the rest of the money?

（1-1
10×4）÷1
15，
=（1-2
5）÷1
15，
=3
5÷1
15，
=9 (branches),
A: the rest of the money can buy nine pencils

100 yuan for stationery, 23.6 yuan less than the rest. How much did you spend on stationery?

It cost (100-23.6) / 2 = 38.2 yuan for stationery

Judgment: Li Hong spent 1.5 yuan on three exercise books, and 2.5 yuan on Li Hua's five exercise books. The amount of money for buying exercise books can form a proportion ()