exam Maths Puzzle Numerical Ability

use elimination to solve the system x-4y=1 and x+2y=19 for x

a.-11
b.3
c.24
d.13

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exam Other Question

Solve: 17-4x/12=5

An 80-pound grass seed mixture is 30% bluegrass seed. How many pounds of seed containing no bluegrass seed (0%) should be added to the seed mixture for a resulting blend that is 20% bluegrass seed? Parallelogram PQRS has PQ=RS=8cm, and diagonal QS=10cm. Point F is on RS, exactly 5cm from S. Let T be the intersection of PF and QS. Find the lengths of TS and TQ.