Calculator Allowed for this question only John mixes sand and cement in the ratio 3: 1.
He needs 900 kg of the mix.
A 135 kg bag of sand costs £8.64.
A 25 kg bag of cement costs £6.59.
Calculate how much it will cost John to make the mix.

X+y=-4 x-y=2 use elimination with adding and subtraction

Car a and car b were in a race .the driver of car b claimed that his car was twice as fast as car a

Amayoral candidate would like to know her residents’ views on a public open space before the mayoral debates. she asks only the people in her office. her co-workers are an example of a census population convenience sample simple random sample