Question

. There are 28 mango trees, 42 apple trees and 21 orange trees have to be planted in rows such that each row contains the same number of trees of one variety only, then minimum number of rows in which the above trees may be planted is:
(a) 13 (b) 12 (c) 11 (d) 10

Answer 1

hey mate here's your answer

same number of trees planted in each row=HCF(28,42,21)

HCF=7

Answer 2

Answer:

a.13 rows

Step-by-step explanation:

HCF of the above numbers

28 = 2*2*7

21=3*7

42=2*3*7

therefore HCF=7 (the only common factor)

therefore 7 trees may be planted in one row

rows required by mango trees =28/7 = 4

rows required by apple tress = 42/7 = 6

rows required by orange trees =21/7 = 3

therefore total rows is 4+6+3=13

hence a minimum of 13 rows are required.