Pls help its very late here!! in a class of 120 students, ⅖ study integrated science and ⅕ study mathematics.
Find the number of students who study
i)Integrated science ii)Mathematics iii)both subjects ​

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post