Bob has one sister.
1. she is 4 years older than twice bob’s age
2. the sum of their ages is 76
what is the answer?

sister is 52

bob is 24

Step-by-step explanation:

Let S = sisters age and B = Bob's age

Bob's sister is 4 years older than twice Bob's age:

mathematically : S = 4 + 2B eq1

the sum of their ages is 76

mathematically : S + B = 76 eq 2

substituting eq 1 into eq2,

S + B = 76

(4+2B) + B = 76

4 + 3B = 76  (subtract 4 from both sides)

3B = 76 -4

3B = 72  (divide both sides by 3)

B = 72/3 = 24 (answer)

substitute value of B into equation 1

S = 4 + 2B

S = 4 + 2(24)

S = 4 + 48

S = 52 (answer)

the total estimated nappy use.=10,500,000

step-by-step explanation:

given that on an average the average baby uses 3528 napkins.

in a particular year 2014, the number of births were 299697 in new south wales.

rounding off the number of births to the nearest hundred thousand we have

no of birtsh = 300000

also rounding off the average usage to nearst thousand we get

average use of a baby = 3500

hence total number of nappy estimated to be used = 3500x300000

= 10,500,000

answer is 10,500,000 nappies

step-by-step explanation:

se a cavasery6