tina is more than 20 yrs old but less than 60. you can count by 7s to reach her age. next year you count by 5s to reach her age how old is she?
21, 28, 35, 42, 49, 56
If you add 1 to a number above, it will end in 5 or 0.
Which is it?
49
Right.
To find Tina's age, we can start by counting by 7s. We know that Tina's age is more than 20 years but less than 60 years. Let's find the first multiple of 7 that falls within this range.
We start by finding the first multiple of 7 that is greater than 20. The first multiple of 7 greater than 20 is 21 (7 * 3 = 21).
Next, to find Tina's current age, we can continue counting by 7s until we reach a multiple of 7 that is less than 60. Let's start from 21 and count by 7s:
21, 28, 35, 42, 49, 56.
Since the next multiple of 7 (63) is greater than 60, we stop at 56. Therefore, Tina's current age is 56 years.
Now, let's calculate Tina's age next year by counting by 5s. We start from 56 and count by 5s:
56, 61, 66, 71, 76.
Therefore, next year, Tina will be 61 years old.