Answer:
Step-by-step explanation:
total marbles=5+8+4+3=20
when he is drawing without replacing means red marble is drawn from 20 marbles.
Blue marble is drawn from 19 marbles.
when he is drawing with replacing means he draws one red marble from 20 marbles.Then he replaces it and draws blue marble from 20 marbles also.
Answer: 16 hours
Step-by-step explanation:
The two equations are:
840 + 17x
and
760 + 22x
with x being the amount of hours
840 + 17x = 760 + 22x
-760
80 + 17x = 22x
-17x
80 = 5x
/5
16 = x
840 + 17(16) = 1,112
760 + 22(16) = 1,112
I'd say by rounding and similar techniques the answer is 468, though it doesn't say all the needed numbers.
