Solve Direct & Inverse Proportion Problems

Interactive macro-enabled MS-Excel spreadsheet. Contents: Find unknowns by solving old-school maths problems (2 variables). Find unknowns by solving old-school maths problems (3 variables). Find unknowns by solving old-school maths problems (4 variables). Find unknowns by solving old-school maths problems (5 variables). Find unknowns by solving old-school maths problems (6 variables). Find the cost of food to produce n items given the cost to make m. Find the calories I consume eating rice cakes using nutritional info. Find the total cost for a party of p people to go on a ride n times. Find the return sum if I exchange £ to € to £ using a buy-back rate. Find the cost of fuel to race go-karts round a track for a given time. Find the time to boil water given the mass of water or heater power. Find the gravitational force a planet exerts on a satellite in orbit. Find the % change in cylinder volume V given a % change in r & h.