Explain how she can divide out the common factors from the numerator and the denominator in one step from 41 over 36 x 60 over 19

In a small section of a stadium there are 40 spectators watching a game between the cook islands and fiji. they all support at least one of the two teams. 25 spectators support the cook islands and 16 of these support both teams. how many support only fiji?

If it 8 inch candle burns at 7/10 inch per hour and a 6 inch candle burns at 1/5 inch per hour after how many hours would both candles be the same height

The product of 3 and a number increased by 8 is 31