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If cb6b7 + 73465 = 166acb find number abc. Multiple solutions may exist.

NUMBERMANIA: Calculate the number 716 using numbers [3, 1, 3, 4, 99, 326] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

NUMBERMANIA: Calculate the number 7490 using numbers [4, 8, 6, 5, 47, 946] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Look at the series (1, 49, 162, 5364, 96481, 100121, ...), determine the pattern, and find the value of the next number.

Find the area of the shaded octagon (A=?, a=1999) and express result to the accuracy of 3 decimal.

Find the area of the green part if diameter of the circle is R=100. Express result to the accuracy of 3 decimal.

Can you find the numbers ABCD so that the following calculation is proved? (ABCD x 4 = DCBA)