1. Let a number be xx+13 = 4 (17-x) x+13 = 68-4xx+13+4x = 68-4x+4x5x+/kl. Let the smallest integer be xx+x+1+x+2+x+3+x+4 = 705x+10 = 705x+65448. 5 x= 12 Let the smallest integer be 12 3. The ratio of Xiao Ming's height to her shadow length = 160:20=8: 1 The ratio of the Eiffel Tower and its shadow length is the same as that of Xiao Ming.

It is also 8: 1. Set the shadow length of the tower as X: 40 = 8: 1. Height of the tower: 40 * 8 = 320m. Note: x/y=x divided by y x*y=x multiplied by y.

Reference: I

Dear friend, the third question is wrong. If the Eiffel Tower is only 3.2cm, no one can stand on it. As for the answer to the third question, we will discuss 1 later. Let x+13 = (x-17) * 4x+18. The sum of the five numbers X- 1, X+ 1 and X+2 is: (x-2)+(x-1)+x+(x+1)+(x+2) = 705x. 16 3) Note that the shadow length is 40m and 20cm respectively. First, the unit should be changed to 20m = 0.2m, and let X be the tower height of 40: x = 0.2:1.640/x = 0.2/1.60.2x = 64x = 320m.

1. A number plus 13 is four times the difference between this number and 17. Find this number and set it as X.

x+ 13 = 4(x- 17)x+ 13 = 4x-68 3x = 8 1x = 27