Asked by kudu
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?
Answers
Answered by
Damon
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
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
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