Omi67

Ich bin so alt wie ich bin. Meine Mutter ist doppelt so alt wie ich. Mein Vater ist 10 jahre älter als meine Mutter. Zusammen sind wir 100 Jahre alt.

So soll es doch sicher heißen?

x + 2x + 2x + 10 = 100

             5x + 10 = 100    |-10

                     5x = 100    | :5

                       x = 18

Du bist 18 Jahre alt. Deine Mutter ist 36 Jahre alt und dein Vater ist 46 Jahre alt.

Wieviel wiegt ein kupferkabel (100 m lang und Querschnitt 1 cm) ?

 2x + 4x + 8 +2x +4x + 8 = 88

                        12x +16 = 88   | -16

                               12x = 72   | :12

                                  x = 6

Gina visited the aquarium with some of her cousins, aunts, and uncles. The group bought 20 admission tickets for $340. Adult tickets cost $20, and children’s tickets cost $15. How many adult tickets and how many children tickets did the group buy?

You need to repaint the floor and inside wall of your circular swimming pool. It has a diameter of 16 feet and a depth of 5 feet. What is the surface area that needs to be repainted? 

The corner of a unit cube is chopped off such that the cut runs through the three vertices adjacent to the vertex of the chosen corner. What is the height of the remaining cube when the freshly-cut face is placed on a table?

Unit cube = 1x1x1 cube

X Squared by 2 subtract x subtract 12 equals 0

1500=0,15*10^4

What is the value of a+c?

Determine the maximum volume of a box with surface area 3000cm2. The box has a square base and no top.