Weekend word problem

20 students came to school on Monday morning. 1/4 forgot their swimming gear. How many students did not go swimming on Monday?

 12 students forgot to do their homework on Tuesday. 2/3 of them forgot to do their Maths and the rest forgot their spelling. How many students forgot their spelling?

 20 students from Room played outside on a hot day. 3/5 of them did not wear sunscreen and got burnt. How many students were sunburnt?