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d1i1m1o1n [39]
2 years ago
14

Sita saves Rs. 1 today, Rs. 2 the next day, Rs. 4 the succeeding day and so on (each saving being twice of the preceding one). W

hat will be total saving in two weeks time?
a
​
Mathematics
1 answer:
Alenkinab [10]2 years ago
3 0

Answer:

Rs. 32767

Step-by-step explanation:

Because the amount is doubling every day, we can use the expression 1*2^15-1 because there is 1 to start with. Also cool trick! if you need to do 2^1+2^2+2^3+....+2^x, it will be equal to 2^(x+1)-1. So:

2^15-1

32768-1

32767

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malfutka [58]
C = # of carpenter hrs , b = # of blacksmith hrs

c + b = 30...c = 30 - b
20c + 25b = 690

20(30 - b) + 25b = 690
600 - 20b + 25b = 690
-20b + 25b = 690 - 600
5b = 90
b = 90/5
b = 18 <== hrs worked as blacksmith

c + b = 30
c + 18 = 30
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7 0
3 years ago
If you rolled two dice, what is the probability
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Answer:

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Step-by-step explanation:

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7 0
1 year ago
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8 0
2 years ago
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I'll do the first one:
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