The lower quartile is 60. Quartiles are the numbers in the middle of the median and lowest/highest number.
Answer:

Step-by-step explanation:
Given
--- heaviest
--- second heaviest
Required
The difference (d)
This is calculated as:

Answer:
147.03 cm^2
Step-by-step explanation:
A= bh
16.9 cm x 8.7 cm
3D8 is divisible by 9 ⇒ sum 3+D+8 is divisible by 9
⇒ 11+D=18, D=18-11, D=7
⇒ 3D8= 378
abc - 378 = 269
abc= 269+378
abc= 647