The answer is £2.80. To find the cost of 1 pen, you divide £4 (all 10 pens) by 10 which gives you 40p. To find 7 pens, you multiply 40p (1 pen) by 7. £0.40 x 7 = £2.80
Well, the first thing we need to do is divide 10 by 4. These teo numbers are the number of pens, and cost of them. So, ================================ 10 / 4 = 2.5 -------------------------------------------------------- Now we have to use the answer we got, 2.5 which is the cost of 1 pen, and multiply it by 7. ================================ 2.5 x 7 = 17.5 -------------------------------------------------------- This means that 7 pens cost <span>£</span>17.5
