# How Much Iron Oar Does John Need?

John needs 500 saw blades

70 saw blades require

40 lengths of steel

and 30 buckets of steel powder

==================

We know that

40 lengths of Steel require

10 buckets of Iron oar

and 30 buckets of coal

30 buckets of Steel powder requires

30 buckets of iron oar

==================

Calculate the following

How much iron oar is needed to make 500 saw blades ?

How much coal is needed to make 500 saw blades ?

What is the formula?

Oar and coal are collected in 20 buckets per trip.

How many trips are needed?

### 6 Answers

- Anonymous2 months ago
Iron ORE!

An oar is something else.

- SpacemanLv 72 months ago
John needs no iron "oar." What he needs is iron ore.

1 saw blade = 0.571428571 length of steel and 0.428571429 bucket of steel powder

1 length of steel = 0.25 bucket of iron ore and 0.75 bucket of coal

1 bucket of steel powder = 1 bucket of iron ore

N = number of saw blades = 500 saw blades

LS = lengths of steel = 40N/70 = 285.7142857 lengths of steel

BSP = buckets of steel powder = 30N/70 = 214.2857143 buckets of steel powder

BIO = buckets of iron ore = 10N/40 = 125 buckets of iron ore

BC = buckets of coal = 30N/40 = 375 buckets of coal

N = LS + BSP + BIO + BC

N = 40N/70 + 30N/70 + 10N/40 + 30N/40

Iron ore, 20 buckets per trip = 6.25 trips

Coal, 20 buckets per trip = 18.75 trips

- JosephLv 72 months ago
He needs two oars to row his boat. If you can't master the difference between an oAR and oRE then you should stick to something more suited to your lack of abilities.

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- billrussell42Lv 72 months ago
500 blades x 40 lengths / 70 blades = 286 lengths

500 blades x 30 buckets powder / 70 blades = 214 buckets powder

286 lengths x 10 buckets iron ore /40 lengths = 71.5 buckets iron ore

286 lengths x 30 buckets coal /40 lengths = 214.5 buckets coal

214 buckets powder x 30 buckets iron ore / 30 buckets powder = 214 buckets iron ore

add up, iron oar = 71.5 + 214 = 285.5 buckets iron ore

coal = 214.5 buckets

total 500 buckets

20 per trip means 25 trips