Page 17 - Start Up Mathematics_6

Total sale for the two weeks together
= ` 3,85,891 + ` 4,00,768 ` 3,85,891

= ` 7,86,659 + ` 4,00,768
Therefore, the sale for two weeks together = ` 7,86,659 ` 7,86,659
The extreme left digit of the number representing sales of the
second week is greater than that of the first week. Therefore,
the sale in the second week is greater. ` 4,00,768
In the second week, the sale is greater by – ` 3,85,891
= ` 4,00,768 – ` 3,85,891 ` 14,877
= ` 14,877
Example 13: Find the difference between the greatest and the least number that can be formed
using the digits 8, 2, 7, 4, 3 with each digit coming only once.
Solution: The greatest number which can be formed using the digits 8, 2, 7, 4 and 3 with each
occurring only once is 87,432.
The smallest number which can be formed using the digits 8, 2, 7, 4 and 3 with each
occurring only once is 23,478.
The difference between the greatest and smallest numbers so formed 87,432
= 87,432 – 23,478 = 63,954 – 23,478
Therefore, the difference between the greatest and 63,954
smallest numbers using the digits 8, 2, 7, 4, 3 = 63,954

Example 14: A machine, on an average, manufactures 3,215 screws a day. How many screws did
it produce in the month of January 2009?
3,215
Solution: Average number of screws manufactured in a day = 3,215 × 31
Number of days in the month of January = 31 3,215
Number of screws produced in the month of January 2009 + 9,645X
= 3,215 × 31 99,665
= 99,665
Therefore, the number of screws produced in the month of January 2009 = 99,665
Example 15: A merchant had ` 88,592 with her. She placed an order for purchasing 40 video
games at ` 1,200 each. How much money will remain with her after the purchase?

Solution: Cost of each video game = ` 1,200 1,200
Cost of 40 video games = ` 1,200 × 40 × 40

= ` 48,000 0000
+ 4,800X
The merchant had ` 88,592 and she placed an order 48,000
for ` 48,000.

Money which will be left with her after the purchase
88,592
of 40 video games = ` 88,592 – ` 48,000 = ` 40,592 – 48,000
Therefore, the money left with her after the purchase 40,592
of 40 video games = ` 40,592
Example 16: To stitch a shirt, 2 m 15 cm cloth is needed. Out of 40 m cloth, how many shirts can
be stitched and how much cloth will remain?

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