Simultaneous equations

How have "Warmsnug" arrived at the prices shown on their windows? Which window has been given an incorrect price?

A table has blocks of wood placed on and next to it. Can you work out how tall it is?

A Sudoku with a twist.

Jasmine buys three different types of plant. How many triffids did she buy?

Plane 1 contains points A, B and C and plane 2 contains points A and B. Find all the points on plane 2 such that the two planes are perpendicular.

Can you find the values at the vertices when you know the values on the edges?

Can you find the value of t in these equations?

Crack this code which depends on taking pairs of letters and using two simultaneous relations and modulus arithmetic to encode the message.

There are four children in a family, two girls, Kate and Sally, and two boys, Tom and Ben. How old are the children?

Five children went into the sweet shop after school. There were choco bars, chews, mini eggs and lollypops, all costing under 50p. Suggest a way in which Nathan could spend all his money.