help please

[senthi]

the latymer school past paper 2005


putting factor 6 suncream on means that you can stay in the sun 6 times longer than is normally safe.

one day last summer it was safe to be in the sun for 1 1/2 hours with the sun cream on, how long would have been safe without it ?

answer is :15 minutes


can anyone explain the work out please .thank you very much for all your help.

[Guest55]

senthi - this is the third question you have posted recently ....

putting factor 6 suncream on means that you can stay in the sun 6 times longer than is normally safe.

one day last summer it was safe to be in the sun for 1 1/2 hours with the sun cream on, how long would have been safe without it ?

So 1.5 hours must be 6 times the safe time; so we need to divide by 6 - 1.5 hours =90 mins

90 divided by 6 = 15 mins

[senthi]

thank you very much guest55.