27.
26. Suppose 2 kg of sugar contams 9 x 10 crystals Find the number of sugar crystals in skg of sugat
In a refugee camp there is enough food provision for 2000 people for 20 days few people have
the camp and the food lasted for 25 days. How many people lent the camp?
The cost of three dozen oranges is 270. What is the cost of eight dozen oranges!
28.
HOTS
29. A train 280 m long is running at a speed of 56 kmph. How much time will it take for the train to
a)
Cross an electric pole?
b)
Cross a 560 m long bridge?
Answers
Answer:
26. Given,
2 kgs of sugar contain 9×106 crystals
∴ 1 kg of sugar contain 29×106 crystals
and 5 kgs of sugar contain 29×106×5 crystals
=2.25×107 crystals
ii) Again,
2 kgs of sugar contain 9×106 crystals
∴ 1 kg of sugar contain 29×106 crystals
and 1.2 kgs of sugar contain 29×106×1.2 crystals
=5.4×106 crystals
27. Given that food was sufficient for 2000 people for 54 days
Hence, after 15 days, the remaining food was sufficient for 2000 people for 39 days (∵ 54 - 15 = 39)
Let xx number of people came after 15 days.
Then, total number of people after 15 days =(2000+x)=(2000+x)
Then, the remaining food was sufficient for (2000+x)(2000+x) people for 20 days
More men, Less days (Indirect Proportion)
(men) 2000 : (2000+x)(2000+x) :: 20 : 39
⇒2000×39=(2000+x)20⇒100×39=(2000+x)⇒3900=2000+x⇒x=3900−2000=1900⇒2000×39=(2000+x)20⇒100×39=(2000+x)⇒3900=2000+x⇒x=3900−2000=1900
28. speed = 56 km / h or
56,000 m distance / train length =
56,000÷3,600 second = 15.555 m per second
train = 280m long ÷ 15.555 = 18.00064 second
Step-by-step explanation: