ck123:Hi all,Can help with the model for this question?Q16) Ali, Bala, Clyde and Dingyi shared a box of pens. Ali received 20% of the total number of pens which Bala, Clyde and Dingyi received altogether. Bala received 50% of the total number of pens which Ali, Clyde and Dingyi received altogether. Clyde received 80% of the total number of pens which Ali, Bala and Dingyi received altogether. Dingyi received 6 pens. How many pens were in the box at first?Thanks alot.A: B+C+D =1:5B: A+C+D =1:2 A+B+D =4:5The total number of units in all three ratios above shd be the same since they're referring to the same total.So, by making the total number of units the same by using lowest common multiple which is 18, the ratios become...A: B+C+D =1:5 = 3:15B: A+C+D =1:2 = 6: 12 A+B+D =4:5 = 8: 10Therefore, A:B:C: D = 3:6:8:1Now, 1u=6 pens18u=6 x 18 =108 pens in total. (answer)