Per capita agricultural land in the U.S. is about 7/2 acres. It decreases, due to several reasons, by 1/250 each year. The population on the other hand
has a yearly increase rate of about 3/200.
What is likely to be per capita agricultural land after 20 years from now on ?
The population, depending on years, will be : 1+3/200, (1+3/200)x(1+3/200), (1+3/200)x(1+3/200)x(1+3/200), ... . The population increase and land decrease
are calculated approximately in ry1 and 2 .
For the population increase we found per capita 1+3/10 and land decrease per unit area we found 1-2/25. Per capita land will be (23/25):(13/10)= 46/65 which
is of course to be multiplied by 7/2 acres of today. 7/2 x 46/65 = 7 x 23/65 = 161/65 = 2 31/65 .
AxB is supposed to be ≤5 . If B=1, there are 5 possibilities, all others are also covered.
(5x7x24)/(6x12x11) = ?
It may be written in the form 10/3 x 1/30 = A x 1/30 .
(A-1) x (B-3) should be ≤ 35; negative fractions are permitted .
Choice d has a dominant factor like 1/100 .
5/3 x 21/5 = ?
In case A=65 it is equivalent to unity.
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