Answer Posted / ranjan

M20 7 days strength

Ft = t
-------- x f28 f28 is strength of 28 days
a+bt
a & b are imperial constants

a = 4.70
b= 0.833

given formula f 7 = 7
------------ x 20
4.7+.833 x 7

=0.665 x 20
=13.3

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