Rob weighs 6 kg more than Kiara.Kiara can lift 6 kg less than one and a half times her weight.Rob can lift a quarter more than his weight.They can both lift the same weight.How much does Rob weigh?

Question

Kiara is changed into K

Rob is equal to R

Answer 1

Rob Kiara

Weighs. R. R - 6. (First sentence says Rob weights 6 kg more than Kiara)

Lifts. 0.25R + R. (Rob can life one quarter more than his weight)

Lifts 1.5 (R-6) - 6. (Kiara can lift 1.5 her weight minus 6)

Because they can both lift the same amount

Robs Weight = 0.25 R + R

Kiara's Weight = 1.5 (R-6)-6

0.25R + R = 1.5 (R-6) - 6

1.25 R = 1.5R - 9 - 6

1.25 R = 1.5 R - 15

-0.25 R = -15

R = 60

Answer 2

Maria

Second sentence : Kiara can lift 1.5 K - 6

Third sentence : Rob can lift 1.25 R

So 1.5 K - 6 = 1,25 R

and R = K + 6 from first sentence

So K = R - 6

1.5 (R-6) - 6 = 1.25 R

Solve this to find R. (SHOULD BE 60)

Mike