Jenny's mom says she has an hour before it's bedtime Jenny spends 1/3 of the hour texting a friend and 1/4 of the time brushing her teeth and putting on pajamas she spends the rest of her time reading her book how many minutes did Jenny read?

Multiply the fractions by the others bottom half, both the top and bottom.

1/3 will be multiplied by 4, and 1/4 will be multiplied by 3

1/3 will be 4/12 and 1/4 will be 3/12

Add 4/12 and 3/12 together to get 7/12

The remaining time, 5/12, is the amount of time she spent reading.