"21 mango trees, 42 apple trees and 56 orange trees have to be planted in rows such that
Channel: Doubtnut
Date: 2020-04-05

"21 mango
 trees, 42 apple trees and 56 orange trees have to be planted in rows such
 that each row contains the same number of trees of one variety only. Minimum
 number of rows in which the trees may be planted is
(a) 3 (b) 15 (c) 17 (d) 20"