Heather asked Granddad to grow flowers at the allotment garden. On Saturday, she went to help with the watering, she noticed the daisies her Granddad had planted in groups of 3 and the carnations had been planted in groups of 13. If Heather watered the same number of each flower, what is the minimum number of each that she must have watered?

You can share your answers here on Facebook or with me as I visit during the week. Remember you need to show your workings out to get the maximum points.