SOLVE THIS!!!!

Algebra Level 3

a chemist has one solution containing 50 % acid and a second one containing 25% of acid how much of each should be used to make 10 litres of a 40 % acid solution ? let the quantity of 50% acid as (a) and the quantity of 25%acid as (b) then write the answer as 50 *a + 25 *b

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