exam Maths Puzzle Numerical Ability

Please help me.

use the subtraction method to solve for s.

3t+5s=10
3t+ s=2

&

4s-5t=7
2s-5t=3

Read Solution (Total 0)

exam Other Question

can you help me step by step on the this

-2-2(1-5)/-2-3 What quantity of 60% acid solution must be mixed with 30% solution to produce 300mL of a 50% solution?