exam Maths Puzzle Numerical Ability

I typed in the wrong equation:

Should be 16-4(y+1) = y+6+5y

I got as far as 16-4y-4 = y+11y

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exam Other Question

given c=(b)*(d/a)*(834 a=1,000,000 b=250 d=8,400 Find the simple interest.

$1,050 deposited at an interest rate of 2% for 9 months. HELP ME THANK YOU