Answer:
average mass of 4 boys=45
or, average mass of 4 boys=sum of weight of 4 boys/4
or,45=total weight/4
therefore, total weight=180kgs
when a new boy joins average mass becomes 40,so,
average mass of 5 boys=40
or,avaerage mass of 5 boys=sum of weights of all 5 boys/5
or,40=(180+x)/5[since the total weight of 4 boys was 180 kgs from the previous calculation and considering 'x' as the weight of the new boy]
or,200=180+x
so,x=200-180
x=20
therefore the mass of the fifth boy is 20kg
Answer:
p : 3.4
Step-by-step explanation:
2.1-2*p=-4.7
2.1+4.7=2*p
2*p=6.8
p=6.8/2= 3.4
Answer:
r=-3,
Step-by-step explanation:
Answer:
40%
Step-by-step explanation:
Divide the result wanted by the amount tried
Answer:
c
Step-by-step explanation:
The boyfriend does not care about terri in the relation ship, so it is not constructive (c). idk why this is a math question, though