I’ve tried 84/280 but doesn’t work!!

4/7 x 21/40

This problem can be reduced.

1/1 x 3/10

In reducing this we cross multiply 4 into 4 is equal to 1, 4 into 40 is equal to 10 and 7 into 7 is equal to 1, 7 into 21 is equal to 3.

Answer = 3/10

2.4+3.2t. you get the answer by adding the ones with variables and ones without