Question

in his orchard. Francis had planted 450trees and had used 675 kg of manure. if he wanted to plant 160 more plants., how much more manure does he need to buy

Answer 1

we can use two methods to solve this question there is unitary method and proportional method
with unitary method
we can solve it like
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450 trees use 675 kg of manure
then 1 tree uses
675/450 kg
that is
1.5 kg
then for 160 trees more we need
160*1.5
we will need 240 kg of more manure
so total would be
675+240
915 kg of manure
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proportional method
----------
450:675::160+450:x
which is 450:675::610:x
product of extremes is equal to product of means
450x=675*610
x=675*610/450
411750/450
which is
915 kg of manure
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thank you
hope this helps