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Simplification - General Aptitude

Q1:

In a regular week, there are 5 working days and for each day, the working hours are 8. A man gets Rs. 2.40 per hour for regular work and Rs. 3.20 per hours for overtime. If he earns Rs. 432 in 4 weeks, then how many hours does he work for ?

A 160

B 175

C 180

D 195

ANS:B - 175

Suppose the man works overtime for x hours. Now, working hours in 4 weeks = (5 x 8 x 4) = 160.  160 x 2.40 + x x 3.20 = 432  3.20x = 432 - 384 = 48  x = 15. Hence, total hours of work = (160 + 15) = 175.