machines

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Summary - Machine is a device that is used to multiply force, or to gain speed, or to change the direction of a force, or transform energy. Levers, pulleys, inclined plane and gears are some of the examples of simple machines..

A machine produces 24 items in 4 hours. How many items does the machine produce in 6 hours? => 40 or 36 or 38 or 32..

A company sold 4332 washing machines in a year. Round the number of washing machines sold to the nearest ten. => 4330 or 4350 or 4340 or 4320..

The cost of a machine decreased from $1800 to $1500. Find the percent of decrease in the cost of the machine. => 21.7% or 31.7% or 16.7% or 26.7%..

The knob indicates that the machine is 'ON'. What angle should the knob be turned to switch 'LOW' the machine. ( Turn in clockwise direction.) => 180° or 90° or 270° or 180°..

A machine can make 1,500 bolts in 3 hours. Which graph shows the relationship between the number of bolts produced by the machine and the time taken? => Graph 4 or Graph 3 or Graph 1 or Graph 2..

A machine produces bolts, of which 10% are defective. Find the probability that in a random sample of 400 bolts produced by the machine, at the most 30 will be defective. => 5.67% or 7.65% or 6.57% or 7.56%..

A machine produces bolts, of which 10% are defective. Find the probability that in a random sample of 400 bolts produced by the machine, 55 or more will be defective. Assume a standard deviation of 6. => 0.970 or 0.0079 or 0.079 or 0.0097..

A manufacturer makes two models A and B of a product, each to be processed by two machines. To complete one unit of model A, machines I and II must work 1 hour and 2 hours respectively. To complete one unit of model B, machines I and II must work 4 hours and 2 hours re..