The ratio of toddlers to infants at a day care center is 7 to 3. If twelve more infants join the day care to change the ratio to 7 to 5, how many toddlers are there at this day care center?  Choose one:
A) 24
B) 36
C) 42
D) 72
E) 120
5x - 3x = 12   So, 2x = 6   hence no of toddlers is 6*7= 
<gadget id="calculator">6*7</gadget>
<output>42</output>
42   Answer will be (42) 42
<result>C</result>
The ratio of toddlers to infants at a day care center is 7 to 3. If twelve more infants join the day care to change the ratio to 7 to 5, how many toddlers are there at this day care center?