exam Maths Puzzle Numerical Ability

problem- If 20 lbs of rice and 10 lbs of potatoes cost $16.20, and 30 lbs of rice and 12 lbs of potatoes cost $23.04, how much will 10 lbs of rice and 50 lbs of potatoes cost?

solve the linear system using the echelon method

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exam Other Question

What is the answer of this equations using the Set Operations: Venn Diagram:
1. TUW?
2. S-W?
3. W'?
4. S'UT'? Robert is on a diet and can have 500 calories for lunch. A 3 0z hamburger on whole wheat bread has 315 calories, and 12 fluid oz of soda has 145 calories. How many french fries can he eat if there are 10 calories in on french fry.