stephaniem0216
22.07.2020 •
Mathematics
the dimensions of a block of stamps are 30 cm wide by 20 cm high. the same number of stamps could also have been arranged in a block 24 cm wide. How high would this second block be? And also pls tell that if it is an inverse proportion OR a direct proportion and why?
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Ответ:
13.95*a+10.95*b=012.95*12
a=12-b
13.95*(12-b)+10.95*b=15.54
16.74-13.95b+10.95*b=15.54
-0.03*b=-0.12
b=4.0
a=12-b
a=8.0 lb at $13.95 b=4.0 lb at $10.95
check
13.95*8.0+10.95*4.0=12.95*12
11.16+04.38=15.54
15.54=15.54
ok