A block measures 22cm by 11cm by 7cm. How many of these blocks will be needed to build a wall 5.5m long, 22cm thick and 3.5m high.
Answers
Answer:
Five cards – the ten, Jack, queen , king and ace of diamonds are well shuffled with their
face downwards – one card is then picked up at random.
(i) What is the probability that the card is the queen.
(ii) If the queen is drawn and put aside, what is the probability, that the second card
picked up is an ace.
Answer:
2,500 blocks
Step-by-step explanation:
Area of the block = L×b×h
= 22×11×7cm
= 242×7cm
= 1694cm
length of the wall= 5.5m= 550cm
breadth of the wall= 22cm
height of the wall=3.5m= 350cm
area of the wall = 550×22×350cm
= 42,35,000cm
no of blocks needed
= area of wall / area of block
= 42,35,000/1694 cm
= 2,500
So 2,500 blocks are needed to build the wall.
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