Class A has 19 pupils and class B has 18 pupils. Both classes sit the same maths test.
The mean score for class A is 77.
The mean score for both classes is 73.
What is the mean score (rounded to 2 DP) in the maths test for class B?

Aplane is flying at 32,500 feet. it needs to rise to 36,000 feet in two stages.• in stage 1, it rises 5% of its initial altitude of 32,500 feet.• in stage 2, it rises at a rate of 125 feet per minute.how many minutes does it take for the plane to rise during stage 2?