Page 90 - Calculating Agriculture Cover 20191124 STUDENT - A

6-14 Equations and Formulas CH 6]

11. Express the number of cubic centimeters 18. Express the number of hours, h, needed for a
(cc), in J liters. (1,000 cc = 1 liter) crew to thin R rows of lettuce at a rate of N
rows/hour.
cc = J x 1000 cc/l
h = R x N/hr.
12. Find the additional cost, C, of a fertilizer
priced at D 1 dollars compared with one 19. A pump throwing G gallons of water per
priced at d 2 dollars. hour fills a tank holding G 1 gallons in 4
hours. Express the amount of water thrown
C = D 1 – d 2 by the pump in one hour, G, in terms of the
capacity of the tank, G 1 gallons.
13. A storage bin used 40 boards, each board
containing 2 x J bd.ft. How many board feet G/hr x 4hrs = G 1
(bd.ft.), T will the bin require? G/hr x 4hrs = G 1
1
T = 40 x 2J bd.ft.
G/hr x 4hrs x 1 = G 1 x 1
14. Express the number of feet of fence, P, 1 4hrs 4hrs
around a rectangular field with the length G/hr x 4hrs x 1 = G 1 x 1
twice as long as its width, W. 4hrs 1 4hrs

P = 2 x ( L + W) G/hr x 4hrs = G 1 x 1
or 4hrs 4hrs

As L = 2 x W then G/hr x 1 = G 1 x 1
P = 2 x [(2xW) + W] 1 4hrs

P = 4W + 2W G/hr = G 1
P = 6W 4hrs

15. A harvester cost an implement dealer C or
dollars. Express the selling price, S, if the G/hr = ÷ 4hrs.
dealer is to receive a 40% margin. (Margin G 1
is based on the cost.)
S = C + (C x 0.40) or 20. Express the number of yards, Y, in a length of
I inches.
S = 1.4 x C
Y = I ÷ 36inches/yard
Margin (df) : The difference between two numbers

16. Out of a brood of N chicks, how many are Solving the Equation (Refer to pages 6-4 to 6-8)
left, L, at the end of one week if 3 are lost
the first day and C chicks are lost each day 21. Eight times a number increased by 12 equals 48.
for the rest of the week? 8y + 12 =48

L = N – [3 + (C x 6)] 22. A number increased by 5 equals 25. Calculate the
number. N+5 = 25
17. Express the cost, C, of G gallons of
lubricating oil at D dollars per drum. (one 23. A number decreased by 15 is equal to 23.
drum holds 55 gallons.)
Calculate the number. N – 15 = 23
C = G x (D/55gallons)
24. Two numbers added together equal 25. If the
larger is four times the smaller, determine the two
numbers. N 1 + N 2 = 25; N 1 = (4)N 2; (4)N 2 +
N 2 = 25; N 2 = 5; N 1 =(4)5 = 20

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