book Maths Puzzle Numerical Ability

the sqaure root of 2x+5 = the sqaure root of 3x+1

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book Other Question

Patrice alone can paint 4 rooms in 10 hours. If she hires April to help her she can paint 4 rooms in 6 hours. If she lets April paint alone how long will it take her to paint 4 rooms? Thanks you guys are GREAT! I was trying to find out what "i" equals from the Ordinary Annuity Formula.

Fv= P[ ((1+i)^n -1)/i ]. The closest I've come to was Fv