Question 1054815
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Hi   
 Let x represent the original constant of proportionality:
2x + 5x = 840
x = 120, 240 beans, 600peas
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{{{(240+b)/600 = 1/2}}} | Cross Multiplying to solve
2(240+b) = 600
b = 60 beans should be added
Checking
300/600 = 1/2 CHECKS!