Gem and her three friends are going on a holiday. There is a buy 2 get one free offer on plane tickets. Tickets cost £600 each. If Gem and her friends are each expected to pay an equal amount towards their tickets, how much does each person pay?

£450

Step-by-step explanation:

If they bought 2 tickets, they could get an extra ticket for free. As there are three of them, they would buy 2 tickets, get one for free and then buy another ticket to make it four.

In that case they would have only paid for 3 tickets.

The total cost of 3 tickets is:

= 600 * 3

= £1,800

The 4 of them would therefore have to pay:

= 1,800 / 4

= £450

= 5

step-by-step explanation:

to find the 15th term substitute n = 15 into the nth term formula

= (- 3 × 15 ) + 50 = - 45 + 50 = 5

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step-by-step explanation: