exam Maths Puzzle Numerical Ability

after you find the axis of symmetry, do you plug it back into the original equation to get the y intercept?

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exam Other Question

Thirty-three kilograms of nickel that was 35% pire were mixed with a nickel alloy that was 21% pure. How many kilograms of each kind were used to produce an alloy that was 27% pure? Two girls went to the store for rice and sugar. One girl bought 3 kilograms of sugar and 2 kilograms of rice for $3.25. The other girl bought 2 kilograms of rice for $2.50. Find the price per kilogram for both the sugar and rice.