a) To find the fraction of 1 hour that is 25 minutes, we need to express 25 minutes as a fraction of 1 hour. There are 60 minutes in 1 hour, so we can write:
25/60
This fraction can be simplified by dividing both the numerator and the denominator by 5:
25/60 = 5/12
Therefore, 25 minutes is equal to 5/12 of 1 hour.
b) Sally bought 2 kg of chicken, and she used 3/5 of it. To find out how much of the chicken she used, we can multiply the amount she bought by 3/5:
(3/5) x 2 kg = 1.2 kg
Therefore, Sally used 1.2 kg of the chicken.
To find out how much chicken she had left, we can subtract the amount she used from the amount she bought:
2 kg - 1.2 kg = 0.8 kg
Finally, we can convert 0.8 kg to grams by multiplying by 1000 (since there are 1000 grams in 1 kilogram):
0.8 kg x 1000 = 800 grams
Therefore, Sally had 800 grams of chicken left.