Ans:

1– **(20 + 5 n) cm**

1st piece –> 1u

2nd piece –> 2u

3u –> 60 cm

1u –> 20 cm (1st piece)

20 cm + 5*n * cm = **(20 + 5 n) cm**

2– **96 z cm**

Length of longest side –> 24*z *× 2 = 48*z *cm

24*z *+ 24*z *+ 48*z * = **96 z cm**

3– **$(5 – 0.50 d)**

Cost of 5 pencils –> $0.50 × *d *= $0.50*d*

$5 – $0.50*d *= **$(5 – 0.50 d)**

4– a–> **(8 f + 10) sweets **, b –>

**(20**

*f*+ 10)/3 sweetsNumber of sweets Rebecca had –> 4*f × *2 = 8*f *sweets

Number of sweets Tanya had –> ** (8 f + 10) ** ———– (a)

Total number of sweets –> 4*f +* 8*f + *8*f *+ 10 = (20*f * + 10)

(20*f *+ 10) ÷ 3 =** (20***f ***+ 10)/3 sweets **————–(b)

5– a –> **$( y – 16)/2 **, b –>

**$34**

2u –> $(*y* – $16)

1u (sandals) –> **$( y – 16)/2 ** ———— (a)

Cost of sandals -> $(52-16)/2 = $18

$18 + $16 =** $34 ** —————–(b)