A contract on construction job specifies a penalty for delay of completion beyond a certain date as follows : $200 for the first day, $250 for the second day, $ 300 for the third day, etc., the penalty for each succeeding day being $50 more than for the preceding day, How much money the contractor has to pay as penalty, if he has delayed the work by 30 days ?

A carpenter was hired to build 192 window frames. The first day he made five frames and each day, thereafter he made two more frames than he made the day before. How many days did it take him to finish the job?

150 workers were engaged to finish a job in a certain number of days. 4 workers dropped out on second day, 4 more workers dropped out on third day and so on. It took 8 more days to finish the work. Find the number of days in which the work was completed.

150 workers were engaged to finish a job in a certain number of days. 4 workers dropped out on second day, 4 more workers dropped out on third day and so on. It took 8 more days to finish the work. Find the number of days in which the work was completed.

In a primary school, the parents were asked about the number of hours they spent per day in helping their. Children to do home work. There were 90 parents who helped for (1)/(2) hour to 1(1)/(2) hours. The distribution of parents according to the time for which, they said they helped is given in the figure below : 20% helped for more than 1 ""1//2 hours per day, 30% helped for (1)/(2)" hour to "1 (1)/(2) hours, 50% did not help at all. Using this, answer the following: How many said that they helped for more than 1 (1)/(2) hours?

In a primary school, the parents were asked about the number of hours they spent per day in helping their. Children to do homw work. There were 90 parents who helped for (1)/(2) hour to 1(1)/(2) hours. The distribution of parents according to the time for which, they said they helped is given in the figure below : 20% helped for more than 1 ""1//2 hours per day, 30% helped for (1)/(2)" hour to "1 (1)/(2) hours, 50% did not help at all. Using this, answer the following: How many parents were surveyed?

In a primary school, the parents were asked about the number of hours they spent per day in helping their. Children to do homw work. There were 90 parents who helped for (1)/(2) hour to 1(1)/(2) hours. The distribution of parents according to the time for which, they said they helped is given in the figure below : 20% helped for more than 1 ""1//2 hours per day, 30% helped for (1)/(2)" hour to "1 (1)/(2) hours, 50% did not help at all. Using this, answer the following: How many said that they did not help?