Question 11
Three students A, B and C are asked to write down the height of a child, the circumference of a circle, the volume of a cup and the weight of a ball. Their responses are tabulated below:
Student | Height of the child (cm) | Circumference of the circle (cm) | Volume of the cup (cm³) | Weight of the ball (g)
A | 90 | 22 | 250 | 510
B | 70 | 21 | 245 | 510
C | 80 | 22 | 250 | 520
If each student has only two correct responses, and the height of the child is xcm, find the value of x.

Student | Height of the child (cm) | Circumference of the circle (cm) | Volume of the cup (cm³) | Weight of the ball (g)
A | 90 | 22 | 250 | 510
B | 70 | 21 | 245 | 510
C | 80 | 22 | 250 | 520
If each student has only two correct responses, and the height of the child is xcm, find the value of x.
