Algebra

Algebra Level pending

In a 10th grade class, each student writes a letter to all the other students of the class. If the total number of letters is 870, how many students are there in the class?


The answer is 30.

This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try refreshing the page, (b) enabling javascript if it is disabled on your browser and, finally, (c) loading the non-javascript version of this page . We're sorry about the hassle.

1 solution

Riju Zacchino
Nov 6, 2014

each child gives a gift to another Therefore

x(x-1)=870 or, x2 - x – 870 or, x2 – 30x – 29x – 870 or, x(x-30) + 29(x-30) or, (x+29)(x-30) x = -29 , x = 30 {are the two factors } x=-29 is not possible so it is X=30

IT IS A BASIC WORD PROBLEMS FROM QUADRATIC EQUATION (THANKS)

0 pending reports

×

Problem Loading...

Note Loading...

Set Loading...