Answer: They will save $6
Explanation:
Science Center
There are 12 students and tickets are 3 for $36.75. There are 4 groups of 3 students, so we can find the price for the science center by multiplication:
4 x 36.75 = 147
Zoo
There are 12 students and tickets are 4 for $51. There are 3 groups of 4 students, so we can find the price for the zoo by multiplying, too:
3 x 51 = 153
To find out how much a group of 12 will save by choosing the science center we subtract
153 - 147 = 6
They will save $6