Since you have 7 liters in all you know that 7 minus 2 is 5.
2*14% + 5*x% = 7*34%
0.28 + 5*x% = 2.38
5*x% = 2.38 - 0.28
5*x% = 2.10
x% = 0.42
x = 42%
Chandra must add 5 liters of 42% solution.
So for a straight line the total is 180 degrees, so angle rpq is 180 - 123 which. makes 57 °. and arc length is just circumference of circle x 57/360. so here, it would be 20πx57/360 so the answer is 9.948..... and round it up 9.9 cm
2,586,203 = 2,000,000 + 500,000 + 80,000 + 6,000 + 200 + 3
Simplify 2/3(b+c) to 2(b+c)/3
a=2(b+c)/3
Multiply both sides by 3
a * 3 = 2(b+c)
Regroup terms
3a=2(b+c)
Divide both sides by 2
3a/2 = b+c
Subtract c from both sides
3a/2 - c = b
Switch sides
b = 3a/2 - c