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 By: shirley wee (offline)  Friday, June 15 2012 @ 11:43 AM CDT (Read 759 times)
shirley wee

Hi everybody! I am stuck with this maths question again.

440 teachers and pupils participated in a tree planting event. Each teacher planted 2 trees and each group of 4 pupils planted 3 trees. If 455 trees were planted altogether during the event, how many pupils participated in the event?

Chatty

Registered: 02/28/12
Posts: 68

 By: GIM (offline)  Sunday, June 17 2012 @ 04:40 AM CDT
GIM

Extract info :
Total people : 440
Total trees planted : 455
Each Teacher planted 2 trees
Each group of 4 students planted 3 trees

Using guess & check method

100 teachers x 2 trees = 200 trees
Remainding students :440-100 = 340
(340/4)groups of students x 3 trees = 255 trees
Total trees planted: 200 + 255 = 455 trees

Therefore, total students participated is 340.

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Registered: 11/07/10
Posts: 70

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