To solve this problem, let's first understand the information given
⇒ says that 150% of expected people showed up
⇒ the number of expected people is 340
⇒ means 150% of 340 is the number of people who showed up
⇒ written mathematically 150% is equivalent to 150/100.
To find the exact number of people we must time 150/100 to 340
That means 510 people showed up
Hope that helped!