Question
If Rina can complete a project in 36 days by working 9
hours a day, how many hours per day should she work to complete the project in 18 days?Solution
ATQ,
Let the efficiency of Rina be 'x' units per hour
Therefore, total work = 9 × 36 × x = 324x units
Let the time she should work to complete the work in 18 days be 'y' hours a day.
ATQ;
324x = 18 × y × x
Or, y = 18
Therefore, she should work for 18 hours a day.
Alternate solution:
Required time = (9 × 36) ÷ 18 = 18 hours
351Â Â Â 261Â Â Â 181Â Â Â 111Â Â Â 51Â Â Â ?
Find the 31st term of the series 25, 29, 33……
632, 560, 494, 434, ?, 332
1331      1000            729       512       ?             216
...2556   636    156    ?    6
3 5 15 75 1125 ?
...1. In series II, if ‘x’ is the right term, then find which of the following statement(s) are true.
I. x/124 is a factor 6 and 8.
73920, 9240, ?, 220, 44, 11
12 78 385 ? 4629 9260
...A number series is given below, which follows a specific pattern. If 'A' represents the 'x'th term and 'B' represents ...
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