exam Maths Puzzle Numerical Ability

Mixing 100% antifreeze with 40% antifreeze to get 20 quarts of 50% antifreeze

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exam Other Question

2B(3-B?)/B^2-9 a football player carried the ball 5 times during a game. he gained 15 yards on the first play, gained 11 yards on the third carry, lost 9 yards on the fourth and had no gain or loss on the fifth carry. what was his total amount of yardage for the game?