mrsjenrucker
16.04.2021 •
Mathematics
Find the sum of the following arithmetic series:
(a) 6-5-16 - -115 (b) 21
(c) 13 + 6 -1 - -106
Find the sum of the first 500 odd numbers.
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Ответ:
12345678910
Step-by-step explanation:
CHA joke lang bestie
Ответ:
80 ml of the first solution and 120 ml of the second solution
Step-by-step explanation:
Let the first solution weigh x ml, let the second solution weigh 200-x ml.
The amount of acid in the first solution is x/100*50=0.5x
The amount of acid in the second one is (200-x)/100*80= 160-0.8x
The quantity of acid in the desired mixture is 200/100*68= 136
0.5x+160-0.8x= 136
0.3x=24
x=80ml of the first solution are needed
200-80=120ml - of the second solution are needed