MBA Exam

A boy starts to paint a fence on one day. On the second day, two more boys join him. On the third day, three more boys join the group and on the fourth day four more boys join the group and so on. If the fence is completely painted this way in exactly 20 days, then find the number of days in which 10 men painting together can paint the fence completely, given that every man can paint twice as fast as a boy can.
plz explain also..

1) 20
2) 154
3) 45
4) 77

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MBA Other Question
If log10 2, log10 (2x – 1) and log10 (2x + 3) be 3 consecutive terms in A.P. then

1) x = 0
2) x = 1
3) x = log<sub>2</sub> 5
4) x = log<sub>10</sub> 2
 Nokia maufactures mobile handsets and marks a price which is 8 times the manufacturing price, and prints it on the handset. They sell it to a distributor at a certain discount. The distributor then sells it to the wholesaler and offers him a discount equal to 3/4th of the discount that he received from the manufacturer. The wholesaler then sells it to the retailer at a discount equal to 2/3rd of the discount he received from the distributor. The retailer finally sells it to the customer at a discount equal to 1/2 the discount that he received from the wholesaler. If all the discounts are given on the price printed on the box and if the wholesaler made a profit of 50%, then who made the least profit?

1) Manufacturer
2) Distributor
3) Wholesaler
4) Retailer