exam Maths Puzzle Numerical Ability

A market vendor wants to mix the liver and the gizzards of chickens to have 40 kilograms of assortment worth 120.00 per kilogram. The liver costs 110.00 per kilogram while the gizzard costs 75.00 per kilogram. How much each kind must be mixed?

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exam Other Question

how do you find f(x)=ax+b in which f(2)=1 and f(-3(=11?
from mathematics for the international student:Mathematics SL-section 1c this is trig identities, if you could please help me prove the following identity true

sin2x / 1-cos2x = 2csc2x-tan

i hope this reads clearly

the left side of the equation is sin2x over 1-cos2x