book Maths Puzzle Numerical Ability

Two tanks contain milk, one testing 3% butterfat and the other 7% butterfat. How much milk should be taken from each tank and mixed together to make 10 gallons of milk that is 4.5

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book Other Question

Given: Triangle ABC, AD=CB, and AC>DB
Prove: M angle ADC> M angle DCB After spending $1550 for tables and $3150 for chairs, a convention center manager finds that 40% of his original budget remains. find the amount that remains.