exam Maths Puzzle Numerical Ability

please helpe me with this problem, 3/5*?=1

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exam Other Question

A student places 2.5 grams of salt in 90 ml. of water. She then transfers 30 ml. of that solution to an evaporating dish. How many grams of salt are in the 30 ml. of solution? could someone check this for me please? I have to factor the polynomials

-3s^2-10s+8
=(5*7)(2*4)