ANSWER PROPERLY OR ELSE. NEED WORKING AND PROPER DETAILED EXPLANATION.

16 The table shows the child-to-staff ratios in a kindergarten. It also shows the number of children in each age group. At the kindergarten there are four rooms, one for each age group in the table.

Erin thinks that 12 members of staff are needed to look after the children in this kindergarten.

What do you think? Show all your working and explain your answer.​