we have measured all the children in the class and the range is 70cm. if the tallest pupil is 1.52 m tall, how tall is the tallest pupil

I think you meant who the smallest.

1. $${\mathtt{1.52}}{\mathtt{\,-\,}}{\mathtt{0.7}} = {\frac{{\mathtt{41}}}{{\mathtt{50}}}} = {\mathtt{0.82}}$$

The tallest student is 1.52m tall. It's given in the question...

I think you might hav made a typo.

Yeah, MG1.....that makes more sense.....