I always found it easiest to draw out the picture
Answer:
28
Step-by-step explanation:
40% 6th graders of 70 total = 28 6th graders
40% 6th graders + 20% 7th graders = 60%
100% - 60% = 40% 8th graders
40% are 8th graders therefore the answer is 28
Answer:
Superficie de un prisma rectangular fórmula
Área de un prisma rectangular = 2la + 2ah + 2lh.
Step-by-step explanation: