Amira spends five minutes at the shop before walking another twenty-three minutes

to get to school.

(c) At what time does Amira reach school?

45. A bird has 2 legs, a cat has 4 legs, an insect has 6 legs and a spider has 8 legs.

Claire looks at some animals and counts all their legs.

She counts 38 legs.

There are twice as many birds as spiders and twice as many cats as insects.

How many of each type of animal can she see?

Answer: ———— birds

————cats

———— insects

———— spiders

(ii) ———— + ———— + ———— = 71

(iii) ———— + ———— + ———— = 83

The prime numbers between 20 and 140 are:

23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109,

113, 119, 127, 131, 137 and 139

(b) Which two groups of three consecutive prime numbers, between 10 and 50, have

a sum which is not prime?

Answer: ———— + ———— + ———— = ————

———— + ———— + ———— = ————