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Let a=litres of 16% catsup and b=litres of 50% catsup, then:

b=1020-a,

0.16a+0.50b=1020×0.30=306

0.16a+0.50(1020-a)=306

0.16a+510-0.50a=306

510-306=0.50a-0.16a

204=0.34a, a=204/0.34=600.

600 litres of 16% catsup and 420 litres of 50% catsup.
by Top Rated User (599k points)

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