machines

Machine A can do a work in 6 hours. Machine B and C together can do the same work in 4 hours. If the three machines are being used together, how long will it take to complete the job? => 3 hours or 2 hours or 2 hours 24 minutes or 3 hours 30 minutes..

A machine can produce 28 bars of soap in one hour. How many bars of soap can the machine produce in 10 hours? => 270 or 290 or 260 or 280..

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

The value of a machine decreases by 13% every year. Brian bought the machine yesterday for $30,000. What will be its value next year? => $25,100 or $26,120 or $26,100 or $27,100..

A machine can produce 28 bars of soap in one hour. How many soaps does the machine produce in 10 hours? => 280+10 or 280 or 280-10 or 280-20..

The rate of change of the maintenance charges per every half-year of a machine is shown. Find the total maintenance charges over the 6 year life of the machine. => 25000$ or 25700$ or 25550$ or 20583$..

A machine can make 1,200 rugs in 3 hours. Which graph shows the relationship between the number of rugs produced by the machine and the time taken? => Graph 2 or Graph 3 or Graph 1 or Graph 4..

A machine produces bolts, of which 10% are defective. Find the probability that in a random sample of 400 bolts produced by the machine, between 35 and 45 will be defective. Assume a standard deviation of 6. => 0.5640 or 0.6405 or 0.4605 or 0.4560..

A company manufactures washing machines. The graph shows the relationship between the years and the number of sales. How many washing machines did the company sell in the year 1998? => 57,000 or 23,000 or 93,000 or 80,000..

A manufacturer makes two models A and B of a product ,each should 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, Machine I and II must work 4 hours and 2 hours..