Jewelery maker has 
24 jade beads 
30 teak Beads
She has to make necklaces with each necklace having the same number of beads 
So we need to find the highest common factor for both 24 and 30
The factors for both numbers are as follows 
24 -1,2,3,4,6,8,12,24
30 - 1,2,3,5,6,10,15,30
The highest common factor for both is 6
The greatest number of necklaces she can make is 6
Number of jade beads - 24/6 = 4 jade beads 
Number of teak beads - 30/6 = 5 teak beads 
So each necklace will have 4 jade beads and 5 teak beads