exam Maths Puzzle Numerical Ability

Can you please help my son with this problem: 12 chirps/min

using the formula F= n/4 + 37

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exam Other Question

9x-3<6-x+9x

What do you do after combining like terms? Erza and tava sold at least 150 cupon books. Erza sold at most 30 books more than twice the number tava sold. Show and describe all possible combinations of the numbers of cupon books erza and tava sold. List two possible combinations.