Question

В) число, если 5/7 от него — это 450; г) число, если 27% от него это 108; д) 7/15 от числа, 30% которого составляют 630; е) число, если известно, что 1/18 от него — это 40% числа 14,4.

Answer 1

Ответ:

Пошаговое объяснение:

450:5*7=630

108*100:27=28

(630*100:30):15*7=980

(14.4*40:100)*18=103.68

Answer 2

Ответ:

630.400. 980, 648

Пошаговое объяснение:

450х7\5=630.  108 :27 Х100=400. (630:30Х100)Х7\15=2100Х7\15=980,(14.4Х100:40):1\18=36:1\18=648

Answer 3

To solve these problems, let's represent the unknown numbers with variables and set up equations based on the given information. Then we can solve for the variables. Let's go through each problem step by step:

В) Let's represent the unknown number with 'x'. The given information is that 5/7 of this number is equal to 450.

Equation: (5/7) * x = 450

To find 'x', we can isolate it by multiplying both sides of the equation by the reciprocal of (5/7), which is (7/5):

x = 450 * (7/5) = 450 * 1.4 = 630

So, the value of 'x' is 630.

г) Let's represent the unknown number with 'y'. The given information is that 27% of this number is equal to 108.

Equation: 0.27 * y = 108

To find 'y', we can divide both sides of the equation by 0.27:

y = 108 / 0.27 = 400

So, the value of 'y' is 400.

д) Let's represent the unknown number with 'z'. The given information is that 7/15 of this number, and 30% of 'z' is equal to 630.

Equation 1: (7/15) * z = 630

Equation 2: 0.30 * z = 630

To find 'z', we can use either of the equations. Let's use Equation 1:

z = 630 * (15/7) = 1350

So, the value of 'z' is 1350.

е) Let's represent the unknown number with 'w'. The given information is that 1/18 of this number is equal to 40% of 14.4.

Equation: (1/18) * w = 0.40 * 14.4

To find 'w', we can multiply both sides of the equation by 18:

w = 0.40 * 14.4 * 18 = 5.76 * 18 = 103.68

So, the value of 'w' is 103.68.

Recap of the results: В) x = 630 г) y = 400 д) z = 1350 е) w = 103.68