Between 2000 and 2015, the number of twin births in a certain country increased 29%, to approximately 157173.
There were approximately  twin births in 2000. (round to the nearest integer)

Let's solve the problem step by step.

We know that the number of twin births in 2015 was approximately 157,173, and this number represents a 29% increase from the number of twin births in 2000. Let \( x \) be the number of twin births in 2000.

The relationship between the number of twin births in 2000 and 2015 can be expressed as:

\[
x \times (1 + 0.29) = 157,173
\]

This simplifies to:

\[
x \times 1.29 = 157,173
\]

To find \( x \), we divide 157,173 by 1.29:

\[
x = \frac{157,173}{1.29} \approx 121,814
\]

So, the approximate number of twin births in 2000 was **121,814**.

Would you like to explore this further, or do you have any questions?

Here are 5 related questions:

1. What would be the percentage increase if the number of twin births rose to 170,000 in 2020?
2. If the number of twin births had increased by 15% instead, what would the total be in 2015?
3. How many twin births would there have been in 2000 if the increase was only 10% by 2015?
4. What was the annual average increase in twin births from 2000 to 2015?
5. How would the calculation change if the number of births in 2015 was given as an exact value rather than an approximation?

**Tip:** When dealing with percentage increases, always start by identifying the base value and applying the percentage to find the final value.

Between 2000 and 2015, the number of twin births in a certain country increased 29%, to approximately 157173. There were approximately twin births in 2000. (round to the nearest integer)

Discover how to calculate the approximate number of twin births in 2000, given a 29% increase to 157,173 by 2015. This problem involves understanding percentage increase and basic algebra, making it ideal for students in Grades 6-8.

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