exam Maths Puzzle Numerical Ability

eleanor can complete two skirts in 15 days. how long will it take her to complete eight skirts

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exam Other Question

2 triangles are similar
Triangle RTS where rt=4.2 and st=6.0 do not know rs
Triangle JLK where lk=8

what is the length of JL
can someone help me with this problem:

Is this a function:

x^2 + y^2 = 36


a. yes
b. no
c. it depends
d. none of the above