Solve for the missing values in the given grids and analyze the pie chart data for months March and April.

The missing value is $\boxed{\text{14x}}$.

Grid Problem (Question 19):
The grid is:

The pattern is that the sum of the numbers in the first column is equal to the sum of the numbers in the second column.
Let the missing value be $z$.

The missing value is $\boxed{\text{7m}}$.

Pie Chart Analysis:
The pie chart shows 720 children born between January and May 2001.

• March: $100^\circ$ (given)
• April: $36^\circ$ (given)
• February: The right angle symbol between Feb and March indicates that the angle for February is $90^\circ$.
• January: The right angle symbol between Jan and May indicates that the angle for January is $90^\circ$.
• May: The sum of angles in a circle is $360^\circ$. Sum of known angles = Angle(Jan) + Angle(Feb) + Angle(March) + Angle(April) $$= 90^\circ + 90^\circ + 100^\circ + 36^\circ$$ $$= 316^\circ$$ Angle(May) = $360^\circ - 316^\circ = 44^\circ$.

The total number of children is 720, corresponding to $360^\circ$.
Number of children per degree = $\frac{720}{360} = 2$ children per degree.

• Children in January: $90^\circ \times 2 = \boxed{\text{180 children}}$
• Children in February: $90^\circ \times 2 = \boxed{\text{180 children}}$
• Children in March: $100^\circ \times 2 = \boxed{\text{200 children}}$
• Children in April: $36^\circ \times 2 = \boxed{\text{72 children}}$
• Children in May: $44^\circ \times 2 = \boxed{\text{88 children}}$