1 hour each day is used for test
so 8-1=7 used per day
so commercial is 1 in the 4:2:1 so
4+2+1=7
ok, so 7 units, 7 hours
4 hour for private
2 hour for research
1 hour of commerical
4*5=20=private
2*15=30=research
1*4=40=commercial
20+30+40=90
percent from commercial
40/90=0.44444444444≈44.44% about 44%
She multiplied 40 by .20 and got 8 and added it to 40 to get 48.
Answer:
I cant help you there is no information
Step-by-step explanation:
The estimate sum of 487 and 320 is 800.
:)