Ilyancappello Ilyancappello
  • 24-11-2014
  • Mathematics
contestada

Dally and Marta had the same number of postcards. After Sally sold 18 of her postcards, Marta had 4 times as many postcards as Sally. How many postcards did each girl have to begin with.

Respuesta :

luana
luana luana
  • 24-11-2014
[tex]x-number\ of\ postcards\\\\4(x-18)=x\\\\4x-72=x\\\\4x-x=72\\\\3x=72\ \ \ \ \ |:3\\\\x=24\\\\Each\ of\ them\ had\ 24\ postcards.[/tex]
Answer Link

Otras preguntas

5 FRIENDS GO OUT TO LUNCH AND ORDER 5 PIZZAS, THE FRIENDS DIVIDED THE PIZZAS EVENLY.FIND HOW MUCH PIZZA EACH FRIEND GOT AS A DECIMAL
How do you do this problem 272 divided by 64
find the cube root of 740
Two fifths the cube of a number
If there are 400 cubic centimeters of a chemical in 1 liter of solution, how many cubic centimeters of water must be added to dilute it to a 25% solution?
write the equation a. a vertical line that passes through the point (2,-6)b. the y axis c.  a horizontal line that passes through the point (1,4)d. the x axis
Three friends want to drive to the park. park A is 3.4 miles from Jamie's house. park B is 15/8 miles from Jamie's house. which park is closer to Jamies house?
how did congress try to settle  the slavery issue in 1850?
Graph the linear equation solve for Y 3x+y=6
how do you simplify 681