Three pupils John, Daniel and David contributed a total of $400 for a party. John contributed $30 more than Daniel while, David contributed three times as much as John. If David contributed $x, write the equation can be used to find David's contribution?
j = dan + 30
dav = 3 j
j + dan + dav = 400
(dan+30) + dan + 3 (dan+30) = 400
5 dan + 120 = 400
5 dan = 280
dan = 56
j = dan + 30 = 86
dav = 3 j = 258
To find David's contribution, we first need to set up an equation based on the given information.
Let's assume that Daniel contributed $d. According to the given information, John contributed $30 more than Daniel, so John's contribution is $d + $30.
Additionally, we know that David contributed three times as much as John. Therefore, David's contribution would be 3 * ($d + $30), which can be written as 3d + 90.
Now, we can set up the equation. The total contribution for the party is $400, so:
$d + ($d + $30) + (3d + 90) = $400
This equation can be used to find David's contribution.