exam Maths Puzzle Numerical Ability

How do I solve using a system of equations in two variables?

Three times the larger of two numbers is equal to four times the smaller. The sum of the numbers i 21. Find the numbers.

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exam Other Question

okay...so my next question:
Calculate the area in metric units:
Find the difference in the area of a straw with a diameter of 5mm and a straw with a diameter of 7 mm. (show your work) Celsius temperature readings can be converted to Fahrenheit readings using the formula f=9/5c+32. What is the Fahrenheit temperature that corresponds to each of the following Celsius temperatures: -10,0,15,100